Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdd53171032f879…

MALICIOUS

PDF

88.7 KB Created: 2021-06-29 19:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98a1934e20510ea258c0896f244601f8 SHA-1: 4ecd70a238c95c1c0e8c212de14b58dfd3d55d1e SHA-256: 1fdd53171032f8798413b1f1315f500e754dbd481328e18fbcb5acd29f2e57b0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites, likely intended to host and distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ec291b23d3df58518323e59525a1c9fa/wokizewi.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859707a4dce---81581807869.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/rimojopipotubej.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/20134787380.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62d20e1430---dawaj.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/77918538691.pdfIn PDF document text
    • http://goldmustang.ru/files/files/21841551803.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607182da80339---20410538690.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816d32dccc8---10461688702.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6b7dcadee---80451404481.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/3f8da0f88be170ec450ecc068f3c3ac5/waleturofotaxem.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/63436167864.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/seduujp7ton06e1rfpi3077143/64421451335.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/3731696293.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94a8a9ce5---sepakasiw.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hm1lbm2pn4k3in588qp6t3c3q0/talegawe.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e713af2f4e---najuri.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/41655053705.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077968ea13e1---26161971220.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accbd1300fa---8035758727.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16071e6239ddb2---rozilejonitixofakifuvev.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/61310142112.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210502212453626.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/buzubexitemezogopuxas.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608feb26cd30d---xuzoxexakudiwiba.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096bc1f541b9---fegovuxutedizejugigakov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=protestations+in+a+sentencePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d2fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD2FC 20432 bytes
SHA-256: c64a429299c228c36a1277a843fa046f36e0780c65a4b71d3f9b81e777e6ae44
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 17752 bytes
SHA-256: 9d225c1e3677c2b1d6218e5e86d59a832d19f0350f030717184995f003588c35
font_02_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 10180 bytes
SHA-256: 17b6e0e3362cfe300a0f60b878a2cff7aefdb18655642902ef58e48afa8c8feb
font_03_sfnt_off00013b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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