Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b161946778eb0b5…

MALICIOUS

PDF

116.2 KB Created: 2021-06-27 18:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54fd1e0d36039d9e2227149afd2f23bd SHA-1: 61661d45437010c7cf1c62792b7678516758ffeb SHA-256: 6b161946778eb0b53858b88fc83f78c6b1ec8afcea26d89c98fb456b7c06910c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to various domains, some of which are compromised WordPress sites, suggesting it's part of a phishing or scam campaign. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://prodottoitalia.eu/userfiles/files/80768650447.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02c82ae26---9858377453.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9a12f174---63597113041.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/urqq8qmgupqk1u06t7cu1nkt68/guwukujimovewuropixukel.pdf
    • https://polnische-zaune.de/userfiles/file/wavukisavesogaxigem.pdf
    • http://cnc-soustruzeni.cz/files/file/79775597657.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe0f5ad6b2---34200114680.pdf
    • http://buergerforum-tirol.at/file/joranupavamesa.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/89047694825.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/4sgclaimeqh6hiu6hvhp72pq8l/10910957853.pdf
    • https://aawyx.com/sites/default/imageuser/file/96136712703.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9etcn4j7k9n2vtegc2jmr37um0/65365131527.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/lhbqlrnk6teu90ufb1ij1hs0js/vabibiminux.pdf
    • https://cvsc.co/userfiles/file/88615885830.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/795039fdabf861f5aa787f97dd16d9e5/4853059348.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/i1q3p6u1usqqa534lmv9bhjs25/lutidevapesoten.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a080d411d80---40917112525.pdf
    • http://maciejabramowicz.pl/upload/files/file/92536651819.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/bc5020ea341448a465b4b5ddbbca1e3c/93847159273.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/l8gj7e3mq017e10vi6clib5le5/bezonelubusofo.pdf
    • https://micsys.in/userfiles/file/magarujo.pdf
    • https://africanresearchcenter.com/userfiles/file/zixazuluxaxe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=emigration+clearance+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ba5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA5 16792 bytes
font_01_sfnt_off000173b7.bin
1f0d2713e86736165d2691a8176d7c6bd7d460b568b368181ebae361546797c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x173B7 21924 bytes
font_02_sfnt_off0001aa8b.bin
0b8cc0f9e6ae756751efe0d54c42efb741c84509b63fa2f6dcb5a60196a7cc2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA8B 10388 bytes