Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ce53b5ac77401b…

MALICIOUS

PDF

85.6 KB Created: 2021-07-26 21:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 656f3908d222fc548fa95aec4e4dd68b SHA-1: eda6e69a117a24194097c29ea51745ef95cba8bd SHA-256: a1ce53b5ac77401b9e5a2c195e04d1c2350a012789f7497d6e3e5d1f0535c050
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a2b84bf23766799ec667620b827ce680/35353102016.pdf In PDF document text
    • http://train-in-japan.com/images/blog//file/98035835845.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607417693c802---sisanejevev.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/dunoxefax.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a17d30078---50719316071.pdfIn PDF document text
    • http://simonide.org/userfiles/file/98995708039.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/95448300763.pdfIn PDF document text
    • http://digifast.cz/userfiles/70820038107.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/rozojodamexovumirox.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/89450160460.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/xikewimipogijag.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/70bf36bef763ead8b88cad7da265206b/zagumuzovekaxil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52129a4784---38933056734.pdfIn PDF document text
    • https://mmszke.hu/files/file/pofololememoperom.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/guguvevufitexuviz.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f235e8c8f61---pujijex.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c694458d9e---47613302225.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160780133f35ad---bagagadidiba.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/noled.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/13fe34572a09ea8c37bd221a9293f8de/58498191550.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b0c477fa31d32154a2bcdc303ae524f0/dozuvovovanokifobewofod.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5b3206536890b4e1db0bb681415af009/dusogej.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/gijoke.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/8khd882hii9fgd95beivrd8r21/fobogepidakijufag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+program+kwikset+888PDF 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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 10824 bytes
SHA-256: 0d0bba4d1642c0ac5b296019d7d8ddae144963d0c4a04271b5fc9e2ce8a7e5b6
font_01_sfnt_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11843 17620 bytes
SHA-256: e8717b44c040badff565683df00409880b1faf77cc866e06cb3eee7f7b2bf570

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