Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a4d8ae94fc1da3…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 03:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 60cec6029c75a1cc0a1ccca5df3cfb21 SHA-1: 02173b240b0b0d99a7954cc7413560ebb776dbfe SHA-256: a2a4d8ae94fc1da350d1e8604ac9202fe74e47a7a641e8a327fefd16371200e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous compromised websites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=hnc+sport+live+tv+download PDF link annotation
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/61331163864.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109021052142736.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/26495441061.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/pegowar.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb36121f01---lexotatobaxubal.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/pudozavas.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/78994349408.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ljr15pl7igf8nuqve7tbr5tnlb/98676651290.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/mobeziwikalojexe.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/xajudumunuzafijisixir.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135222b1d82f---nizesolilafubiluzel.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/53820916059.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/pipimuzutonip.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/40092480052.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/demuxixaxefupatej.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/i00eqepl5li1agbitlmnlndjoa/newiworej.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ceab78e74c533d9cfb229b55107b0c57/2523859151.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613363e9bc570---73326348972.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cfe75861a---xusunuluvedobamedejod.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/23172916136.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/91826104391.pdfIn PDF document text
    • http://myphamasia.net/upload/files/97311689649.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16138c76544d46---90418523974.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/fuwinefakep.pdfIn PDF document text
    • 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_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 10648 bytes
SHA-256: 68f45c5d40704cdc262e730d0eb4411287ec456270778f296cb839952456b2f8
font_02_sfnt_off0001170b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 17276 bytes
SHA-256: e37fc0ee01c66180fff3e2341e5829f9197537ac3669ddb002823f29bc11700d

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