Malicious PDF — malware analysis report

Static analysis result for SHA-256 28835dcfd688c30f…

MALICIOUS

PDF

86.9 KB Created: 2021-09-19 09:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ede297439e321bbed03fb7ec157546eb SHA-1: 1060fccec718b20a1667a37ff45c2a41be1fc180 SHA-256: 28835dcfd688c30fa8d4059b8742357cc2eb63bb5d22a49008bcc13b2560c70c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and scam lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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 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 https://pistant.ru/uplcv?utm_term=metal+slug+online+co+op PDF link annotation
    • http://asirakademi.com/resimler/files/91160823296.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/36219493876.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/84582129919.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161438ef06b31f---36124423126.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f774e2bc68---6583272294.pdfIn PDF document text
    • https://harom.ro/files/file/supizadimimovifuleka.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/fejanafonefu.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/zowumamarukamuxurikiv.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434cf47f2b5---nuxatejojenef.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/69456955421.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/baleziporenuzagas.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/27474685384.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/xadoxaxefafodejigimozimoj.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/67773282758.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/46369941045.pdfIn PDF document text
    • http://rnralpha.cz/res/file/gulosefadiruwixekimasune.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c5ec8affb---suzevoxikirafinuvoko.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ac75c6a54---numarafoxuzunilaxuvulipi.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/rukujiwatopuf.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/gimaforepivekobaxepogam.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/sixodenobo.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c47b25061---kavovifilunuralaxoga.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/77537693719.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/xepimo.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/vegawotojubab.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 10540 bytes
SHA-256: cf056a687e20047f2996d60ca719c46cb12055723c26b2a4d0c416e572ebe186
font_02_sfnt_off00011cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 18796 bytes
SHA-256: c028e41ff95a82df12eb5de97e30fb5bc7598a5c28383c8a306107650264fcbe

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