Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70a27d4b7dc89d2…

MALICIOUS

PDF

88.5 KB Created: 2021-09-06 14:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7edd13f7c63d14a723246388fde3e356 SHA-1: 63bc433d11099fb4a3fe11d4f7889d727a5693b4 SHA-256: a70a27d4b7dc89d2ccb309cf1cff6848e76b736eb8b4ca1f18ab4cf664a29b47
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or SEO poisoning. While no scripts were explicitly extracted, the presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests the document's primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • 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.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987a45a3a7b---definuwupiv.pdf In PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/fopum.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612b59eb2372a---57479568924.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/18416431015.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c67dec2329---sededibofade.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609290be0c2ea---49243871852.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/11776397350.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/pajetaxigidemupumobizu.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/bbfd70cc0f31b0e20b3cc52e067770cc/nenazilevide.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/61622825812.pdfIn PDF document text
    • https://ka-base.no/images_content/file/xavapejufefunotiluxugixex.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/4e906a009c14960331d023f6fb84458b/28659610225.pdfIn PDF document text
    • http://zgic.ru/!upload/files/36329507737.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/85740718188.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/61500060669.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/26976214973.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/dimasuratimevasevo.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/jituz.pdfIn macro / runtime command snippet
    • https://dascalita.ro/app/webroot/files/userfiles/files/74282632215.pdfIn macro / runtime command snippet
    • http://mientrungland.net/uploads/image/files/59336994792.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/cihrq9f7j0bn5035lbp9k88442/vuxinisonofi.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/wasawibopibosati.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/5dad8e243b017d4c3a8bbb48562c8192/5617039477.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726a3c8c589---mavonegomitomego.pdfIn PDF document text
    • http://colafranceschi.iIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=yealink+t23g+admin+manualPDF 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_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 17748 bytes
SHA-256: 24db8bc9f943ac49a5694a0fe42875467b2bd1c52952b2f2d30c17f705ce87bf
font_01_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2F 10672 bytes
SHA-256: d6ef65fba5353c4b500cf20bc06e487066e48cba84e938d3a2af68d07ff14a43

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