Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f9056f799eb43f…

MALICIOUS

PDF

128.1 KB Created: 2021-07-04 11:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 5a311efbdcf5f0ee97afcefb0e9ff2ec SHA-1: d19fad906d60680527f50f7655da8a0730f68ca5 SHA-256: 21f9056f799eb43ffe7926706b0b3cfa075f46d9fb450d54be0ab3de571d5785
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to host further malicious content or phishing pages. The document body is heavily obfuscated and unreadable, but the presence of numerous links and the heuristic firings strongly suggest a malicious intent to redirect users to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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) or Microsoft license-boilerplate 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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949cae0b728---39188393047.pdf In PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/7td1q7hfmoe5melg6q8ts7ukh1/15908664371.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/32467809727.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/gidurolegusunisisomex.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/70d923558806a6cb7c75269a8b03ead5/pipuk.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/47358045231.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210621133621_joy3c9.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b698d8b68---gifavasowiped.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c9aed80c0---mujimamixojafubotugimim.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a3a93eee26c204f05390800db889ff7b/motofud.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/92f03b88065c5eb99a437db65a04b095/88600254542.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5da88ab452---24819665477.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6d2f09984---tofodo.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b2228cf3e9b226bd9af10c49ca41cab8/46514252040.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d1ad2da90a6272963e17c670329d60f5/61051851237.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/58581230080.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rtp8d3c6ll2boghpidm373tc53/vujarapevoj.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9be032f7e11e59cddb1f9a4f79d250fd/doriwa.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/22839881291.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/58081272920.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4fc892fcd8c060bb437b1bfecdcc4fcd/80576570510.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9e8770c1a83d62ae4b2f9d4f490b9ca9/20706034001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dictation+text+for+beginnersPDF 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_off000193dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001abf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABF4 10708 bytes
SHA-256: 2f8ec397b3b8bed0da14f1e9e9120411af9361b61b677c4fbeaf9f7f87ada82e
font_02_sfnt_off0001c4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4BE 17536 bytes
SHA-256: 2be111f4250644f0fc6a5c3dba6590b882fc316da7569ce169d7fddfeade1e65

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