Malicious PDF — malware analysis report

Static analysis result for SHA-256 694a4beea4b97176…

MALICIOUS

PDF

85.0 KB Created: 2021-09-15 12:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f90c44bcc23a9f17efcd8f37725303e0 SHA-1: a9bfa2c639a9e1bf9d9ca283c43de1ef3e445383 SHA-256: 694a4beea4b97176717ad1cc995a374a86143c98ea233a1c7701e2d266281913
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which appear to be compromised or disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, aiming to trick the user into interacting further. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

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 http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eb5ba8c97---92960202673.pdf In PDF document text
    • http://wawa757.com/uploads/files/97838287547.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/19706759995.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/domututoromosexi.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/31480858259.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78431734393.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/79582227273.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/3035570172.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/fitefuwa.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/xigalopizezagemoz.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d34c3ece6530485b9d348b2618e8327a/70384131823.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/15636348200.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/57964846415.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/mifodiladolupixegonajol.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/66625392424.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/46752063937.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/ba4a44.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/44228032634.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/11307561237.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/tutajarimo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f545643b60---97490687238.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/48581211201.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/33943316481.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/27571789841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=moto+g+stylus+2021+price+in+bangladeshPDF 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_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 18640 bytes
SHA-256: b831e47ff7807e8bccb3dee2a7b35e6c68dfec536a5ecc307558c5ae3cdd1a72
font_01_sfnt_off0001131d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131D 11432 bytes
SHA-256: c7e8291243e94058ea499405ec3981541ef7c2d94dd73d7311dea56a05b21232
font_02_sfnt_off00012dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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