Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4884b72d8cd128…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 18:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44f9bd954ab9a91d6f81c09204e20165 SHA-1: 91cb76b7d95bec36e6ae2beaf007ea2818c5a472 SHA-256: 2b4884b72d8cd128f7a5bcc774724e15610ee64793321da5dd6a541a88667d6a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document contains external links. The callback lure heuristic explicitly points to a phishing or tech-support scam pattern, aiming to trick users into calling a number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://hssanesteban.cl/files/xobimime.pdf In PDF document text
    • http://cochemical.com/upload/files/zefopelanededadisijefozi.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/28972435218.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/safogeronojiwumujukuxir.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/regabavof.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/jowinopa.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/fotusinomotaba.pdfIn PDF document text
    • http://electric-kernbichler.at/fulepojaxi.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/44036502357.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/34360681481.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/28876606930.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/47069534391.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/47064275042.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xumovaga.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132380a30cfe---bugumobudekibabowomapanor.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5527bf0c---zisexoburerotowuxulila.pdfIn PDF document text
    • https://laps.pl/userfiles/file/73545114664.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/bisazaxowidevasukogito.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/wunogunexanubefo.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/3156675558.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a422cb91cf---pibijexoza.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/79970526468.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210912030234.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/83451877313.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/19167815979.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614185f544a39---77278850627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+change+3g+to+4g+in+android+phonePDF 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_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 10908 bytes
SHA-256: 79fb5eac0bdd9d6aa428dd36125ff3de300fe5fcbb066a8a9724002ab389fc4e
font_01_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001123b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123B 17796 bytes
SHA-256: d2805abf5ac1da553758126f24f0f619a80c7197f52bce3f80dead679f810e38

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