Malicious PDF — malware analysis report

Static analysis result for SHA-256 14bd861b55dd8a84…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 20:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db7ed8c93b72720d1bf828cea5a9b517 SHA-1: 9848ac3cf5dc9ff55e2334455a7b5eb33b6db629 SHA-256: 14bd861b55dd8a84f1a6fb393dbe5e217c3081e32b1d72df8234820f7a95cbc8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload locations, suggesting a link farm designed to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic indicates the document may also prompt users to call a phone number, a common tactic in tech-support scams or phishing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://perlawarmii.pl/userfiles/file/40081415044.pdf In PDF document text
    • http://wonikqnc.com/upload/editor/file/1631127631.pdfIn PDF document text
    • http://anpharma.net/upload/files/17328860228.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/bonipisamudofo.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/25991748937.pdfIn PDF document text
    • http://asustainable.com/global/file/55951647582.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/guluvegosiviluvaminaweji.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/zijokugemawatasa.pdfIn PDF document text
    • http://theponghop.com/upload/files/71066808384.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/81654330067.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210911_192727.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9d164f50---jubozob.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/76472978828.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/rivarita.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/kogozaletetunikagojis.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/51423511987.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/42923739601.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/29425427257.pdfIn PDF document text
    • http://canoeing.by/pics/files/69908312211.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/79770069474.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/29805869400.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161326b4a3021c---87378773031.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7b4816509---likiwelazudezamonisid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=daughter+of+the+forest+pdfPDF 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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 10636 bytes
SHA-256: 1cc3aef00fdc27335dbd9cf67038739d88c7cd5bc2cb871e1d0dc701756c2ca2
font_02_sfnt_off00011832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11832 18268 bytes
SHA-256: fae064fb5c6a2efb7ab1a6346f6e5b11f0b3b189373460613194353fbf7d45c1

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