Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5e5de4bcbcbf40…

MALICIOUS

PDF

88.7 KB Created: 2021-08-18 10:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c36d0be64a4ef3499eb151b6a174dec6 SHA-1: 8594d97ba93843a3a473838b45abe2c6c2e9f629 SHA-256: 3a5e5de4bcbcbf4007d297b21166c51b616e288a78c0be677a28e79502465487
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://ore-processing.ru/d/files/gofakuvemazalof.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaca5a84da7---53440775237.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/9041752059.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/deec0de10d357bb57de53fded2fd5728/xiwobataba.pdfIn PDF document text
    • https://umartravel.com/files/jugemosonexoremo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/b81c4969053379f2da7ffbbb09c2136c/zimopineruwatafuj.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608f309f49482---duwitiseg.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/tiriwabojivasikekowabejag.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/19987613861.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/44510583047.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/27ea689fb129688dc5fec90f8f3310bf/48433043065.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/karudukoliwiparowuso.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/9123206094.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/sinugipiwutanupumani.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161024c2161458---xusurifajapomobemi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16087e11991c52---75973979482.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16108c2b4ef02a---nuwel.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ecfe82dfff70f649d8802dd549d8ae95/jabisakivolulebug.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec43976f0d9---gajonanipepusipebabexud.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/32808908204.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b7aa181ade4029e7e78e8870cc6c7815/57182236564.pdfIn PDF document text
    • https://petek.biz/resimler/files/fodovutedulonudeva.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/44860085100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=causes+and+consequences+of+rural+urban+migration+in+developing+countriesPDF 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_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 16764 bytes
SHA-256: bc468edf0f35c870fcf7d62717881f322f32a1e54eb9ab973ec43f10247cf8af
font_01_sfnt_off0001210c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13923 11448 bytes
SHA-256: a556f29014e2767de23a1f2ee7a631255c0fa51d7681875f2ee51bdfd03b689b

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