Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec178a5f461130e1…

MALICIOUS

PDF

103.1 KB Created: 2021-09-03 16:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc1c370ebed1218036e944b9dceecb67 SHA-1: 469ab5349b8eb3ef4b1a6e8cadb093fb6907a084 SHA-256: ec178a5f461130e11052cbbb1e543a1dc5e7c0a66e879b3f14be245f48a28c1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The PDF's structure and embedded links are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e579a12bae---sowaposatiw.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16115b38d4c0f4---gojomoweforegozov.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/xufobojujipuli.pdfIn PDF document text
    • http://spakimthi.com/upload/files/lipajipo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ad0d08708---6479622597.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/vuduxag.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4bffd42628fcb5f7b66a6e3f086ddc68/52153779326.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/5k9g8q1r5ut7dt93m1i63rmlbn/rumabefev.pdfIn PDF document text
    • http://cuiquji.net/d/files/56578183712.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504065949364729.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0733c9e097401a5eee69129eea657f28/xuradozuwozimikegorakegi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/o66jru0q3nujvdqtrcp73d07dr/zevazonuranobavipuvi.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/bajesurufurezapek.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/gumofefabexugasulug.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/gositugot.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/546e6757a9b7c3cc8096e93530b23ad0/62189732598.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/sokuzarowemenomexofe.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3abc666b2---46587454826.pdfIn PDF document text
    • http://szm.hu/userfiles/file/modijibobekotugopapix.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/budenuzage.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/dojudodajexubamelaraxiv.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/23674301194.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161208e1918e46---guvomubifezev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=optoma+x341+datasheet+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/77619847929.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 16532 bytes
SHA-256: 21aae330e59a8ae775fa3d1eb35fd0d57ba133289a935279de5b96b005d6d1ac
font_01_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 25524 bytes
SHA-256: 1fe890bdaeb88a1f84f84f77d2f24b7ed9ff59e3737f49c81cd26c38d0366a7a
font_02_sfnt_off00015cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF7 10848 bytes
SHA-256: 1f99536d68d41b560414d1e0b24b1827799cf32cafc6e9f229b755399d54b897
font_03_sfnt_off00017634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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