Malicious PDF — malware analysis report

Static analysis result for SHA-256 b381c4ac705a1c50…

MALICIOUS

PDF

85.3 KB Created: 2021-07-03 11:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e6d495e501decbfc578be3af7b369099 SHA-1: f9426e67ad818c73d9b69ca8b24df579a81a46c0 SHA-256: b381c4ac705a1c50fd3ec20b4e3d5ed00fe86790f2dc8f2136207cd1692bd47b
176 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to disposable hosting and compromised CMS upload storage, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection further support its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sjalikave.hu/pictures/file/vufatibusokegugosupad.pdf In PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/nl1qdbg5mrghtlqvf3pn7jrtpo/75249772076.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87977370754.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/lmj8j3nfb4albv58gb8obk3tr3/20056792541.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1e8a7139c585e5d4317cb24c588b2435/47331509199.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210514151234178.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b47b77c74---83168793417.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/93156fa7bc212490bb456b8ca189313b/99406437141.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4e3c5a56e---16841356275.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/dcf5f45eec237d39e00e61ae054b6e16/gijisazegutuz.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3a3e378ce6f7b4482e74ff25a96afb9d/17562940509.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/f2d64446d1c475da518d56359c35e879/legatako.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8760cf5d6---josawemujusiviroloso.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/77958778721.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c4ccbe55e3d2901c0184dd132ca27caa/40870236321.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f44f3bfa---vovofunobuvapaxagewatudim.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a000cd797c---21255065392.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c57e9619a---39604648364.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba734fa30---sivuligen.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a846a45276---xedoloxetevobozum.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/gufasomifikovudip.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/61174379188.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608556ec24a5d---doderonag.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202151631166440.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/bonozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+out+of+passive+mode+in+gtaPDF 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_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 17300 bytes
SHA-256: 34858b2f67143a94159365980a5389af5e4eb2454ecd9f0a240d59424ba0ba54
font_01_sfnt_off00011674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8B 10940 bytes
SHA-256: 70d504b319d1f46f7a9d630a76f836c61d4cc4f803b9162d35616a3136a159d3

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