Malicious PDF — malware analysis report

Static analysis result for SHA-256 176b97fd9606e3d4…

MALICIOUS

PDF

85.7 KB Created: 2021-07-18 08:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 544eca51b3983915d413b01fafcecea5 SHA-1: 6a3ff468e9ebf9c562532812b06eef070e4d4d74 SHA-256: 176b97fd9606e3d4c91c65e78f61d731e1ad19c44c255f4466c5d55c63f385c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The primary attack pattern involves luring users through a malicious attachment and then directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c564182db68---62398155718.pdf In PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b108e59fd---xuxof.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/20628210702.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/48583483733.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/jogogezejarasubeka.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa301010c77---45109171367.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f3335b611---96009481538.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/samukomorizanosix.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/6585550417.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/kupus.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/206c3ffa12bf9b61775278bdfb8e9df6/33787037877.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/metilumesusa.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/40015449189.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/83340788436.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/jinopovesetomifuwize.pdfIn PDF document text
    • http://moristas.com/userfiles/files/63146547738.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852c25acf2e---pitebitij.pdfIn PDF document text
    • http://stepsforstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/96617191932.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/bbce7ac6fd2fdc14565e7a5d1bfed5bf/mifitevesamemuxamuto.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dd00d545e---70833949336.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d47bea86944---96968090007.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/6623586597.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abcd4c2d58---famasumajiguzuka.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b06a5edd1c5---33601807323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=biggest+data+science+companiesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 17252 bytes
SHA-256: dcf1bfc7da7da1881304fc26e381bc63c3f35dd84d14362dbc7f5dc5dcf64b02
font_01_sfnt_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF2 10764 bytes
SHA-256: bb270bef8505cf949dbeec8661ffe9d5e0996dcad6cd906f0b0ce01ca3a24ebb

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