Malicious PDF — malware analysis report

Static analysis result for SHA-256 103be71930ad8b17…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 22:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4fa97a3c83353ba0c98b768cc9e83864 SHA-1: 6a98f6e384f3843eeac300665705477b7e25d602 SHA-256: 103be71930ad8b17d3f8794408366399b68726ee24058fd013010843d546191c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm or redirection mechanism. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. No scripts were extracted, but the presence of external links and the callback lure strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=long+haircuts+for+diamond+shaped+faces PDF link annotation
    • http://th-hl.com///upload/files/70457106020.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/43183832871.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/54511748428.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/gumitegomagemonuziwuwomez.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea03335e1---88843711789.pdfIn PDF document text
    • http://yanartextil.com/firma/files/vigeg.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/29733701215.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130325b185a9---gepumurowatam.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/60492214398.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320cbcedeb6---nurizukob.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/vutuj.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/53849086352.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/1353235403.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/derowukug.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/35672665828.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/76163852167.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210901_005034.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/nugipifesatirizoni.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/16860047114.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/livofe.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/55338085312.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/komatideja.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/dubapipakakefadov.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/kamijezelatafube.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_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 17732 bytes
SHA-256: 77cb5b8939b0fa00f119eaa6ed130c7497fe2b1e405d91550dab4cc08b91812f
font_02_sfnt_off0001276e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 11076 bytes
SHA-256: c87c86550e4a4e07f65206ccdfc6e14ac69aa2072fc5fbbfa4d3a862548e48e9

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