Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fec7deb8dfc43d…

MALICIOUS

PDF

74.8 KB Created: 2021-05-28 17:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 95133b95d77a0c3dd243518e6a16c32a SHA-1: 68aa826c104a1d38516abe70781f48315a17a230 SHA-256: e5fec7deb8dfc43dda08f7ccc42c3e390822bcecb0442c7c63a4d7f47f89a43c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm designed to redirect users to malicious sites, masquerading as a search result for a common query. Several heuristics indicate the presence of a link farm hosted on compromised WordPress sites and disposable domains. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=what+does+it+mean+when+you+dream+of+snakes+while+pregnant PDF link annotation
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a433f46f33---gubumulijanewadiso.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c52bc75aa0---ponizurupemikujux.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609461ab347f3---87401303869.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca3fdc389---robopopumokoje.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/9fbd8b1cbe82265d51b331c8ce776374/jiwupipuvibe.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9c9ea16102a348dfcfff6269a75d0ed7/bifoxevik.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/emh3gnjk2hjbr08165cvj2lt66/28232591028.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9aad49f2---93814679053.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/fokijerarekevawuxewemeto.pdfIn PDF document text
    • http://sooclose.eu/upload/File/70641343903.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f38a6eab92---noparimofegevabovo.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fadd5d4e2b8dfa6817f5148a948cc67c/pubotanija.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/274aaf03ce7300b0ca9dfa4c12342153/notetudeberasejisoxige.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/zirosalepowoxal.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/886974cf95838b85294a9ce16944be65/83657149221.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/054fde13daa5d53e5260501315d82716/vujavokuxotasiginazog.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/4r82u5da94spchlm6fd35fu7h1/fodutirijevorafadurejux.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d972b95d---fisufuzuxinifaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 5608 bytes
SHA-256: a8b11d326b2f1f099ca0f31f7544800c263e06c9765e0731ca5d80765dcf2e3c
font_01_sfnt_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 10084 bytes
SHA-256: 0140025c517483d93c4474965e5e879b7b780a00901915c2ab6a3228da62a31e
font_02_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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