Malicious PDF — malware analysis report

Static analysis result for SHA-256 93effe93dd9e7c81…

MALICIOUS

PDF

91.9 KB Created: 2021-09-06 23:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e80798f46184cfd86b421de704bcbfec SHA-1: 813181e94ef1684e47372406f58f14c6eb405de8 SHA-256: 93effe93dd9e7c812e1a19f80327d820ad213b7f9aad33e124a4a2c66e4af574
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/cl0tkeds7bhdp6vho382ioe9c7/navamazuduja.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdcf625509---57206407318.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/89489026725.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/gumajuw.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/50794952068.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/99753794941.pdfIn PDF document text
    • http://strandedtattoo.net/file/winewejota.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/7404142956.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa3703a7115---jidoxunex.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/kadamidoxu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160816a96ecbcb---basanokobekisaxije.pdfIn PDF document text
    • https://kaimano.it/file/gabosul.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/61901517550.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/63390263205.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/gowogosidaxoleto.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/80180999501.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/31138218414.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607523d608b5d---lamafi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607377a6beec8---45293821186.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/91437065562.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e76fa036bf3---tolanodivudexexomixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=rpp+keanekaragaman+hayati+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_off0000fbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 10860 bytes
SHA-256: ee88b46b475d82cdbb200441e54945abfbe0bd506bd04be87faf834252b1090b
font_02_sfnt_off00012c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9D 20816 bytes
SHA-256: d27e2663baa0d04c354cb0b4b54520dd428190f86cd5f405c3ffd7e945923a31