Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7221c82d3b1c20…

MALICIOUS

PDF

76.3 KB Created: 2021-09-23 18:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2b13f91c5562e9faf14995ac0d975bb SHA-1: abef397f2c179abe6e3cd71aebcc55d507817c31 SHA-256: de7221c82d3b1c207918a2f2e053de1647e6d2a26c812a72c78e6e956ab4f525
192 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and multiple external links, some of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of a download button lure and callback phishing pretext suggests a phishing or scam attempt, likely to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 9

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alisawedding.com/upload/users/files/nemuguk.pdf In PDF document text
    • http://dok-vo.ru/userfiles/file/gijibu.pdfIn PDF document text
    • https://limadelimon.com/images/file/73066262055.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210912024451.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/88068259642.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7cc7167e13d87e2746338aa88863c5e1/xejotuwegoteg.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/xupojerovopuluvix.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/0e6e3n2ocqi2tar2h3k22enbc9/gadimujor.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/443897554.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/rakamitobadomudotikawipiv.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/53207292160.pdfIn PDF document text
    • http://rayanchem.com/d/files/reredo.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/96752353980.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/30996043751.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/vaxem.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/065f4eb0dba94ff5ebd8949d1ab574d0/mitelave.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210914071117.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/46099121390.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/sojolapuve.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/67246360943.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/gawewovirijefobi.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/19095721335.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/sasizalajovowobakoz.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/25118344603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=speakout+upper+intermediate+student+book+answer+key+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_off0000c2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC5 17404 bytes
SHA-256: d2844f0c36cfdfb05623426fbd8be92c72d9e128a3ed1ab2b290dfe21f45781c
font_02_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 11220 bytes
SHA-256: d6e1a67d4205cc024ef4764b517cda5f9f6b0e12f8cb5dfc0190f910a22fa0d6

Open this report in the interactive analyzer, or submit your own file for analysis.