Malicious PDF — malware analysis report

Static analysis result for SHA-256 774cdd66fecfd106…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 21:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 99267c39b22209aed3851f5d230ced87 SHA-1: a2ce6bffdbb8d811c761d60ff1a55d659703f7b7 SHA-256: 774cdd66fecfd106a0f13b59a6af3c68683bf7de0d1c2c3bdb63e7a8022feb24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=telugu+news+papers+app+for+android PDF link annotation
    • https://assignmentmart.com/ckfinder/userfiles/files/wobupowamotapeposefi.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///lesadefefumuzimup.pdfIn PDF document text
    • http://alternativecarrepair.com/userfiles/file/falope.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/gugifabopipowumijimagafi.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/lowezolu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139b2d43eee7---37739038553.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141b513e422a---57560742380.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/29339033740.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/zigufirumisefimofu.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/rulonotimiketeb.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa3a11e43---gobutox.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/linoxotosopukawejov.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/b633be4ed3b5cbad9d7913c7b0200a23/gajojopajinenowuzijuvitel.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/zuwuzenalamupivimepesu.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/71419603818.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7fed4b92610b6530ca07915351e3b874/fofiranegoxulokizupimadog.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3s10afkoquplg71f2fl3o5m9k0/78856672905.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/30171992918.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/51009070879.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b4f912963b295fc2c789b132ffdd0f7c/jepamarezenaxejuximopala.pdfIn PDF document text
    • http://precisao.org/files/files/kafenupimufaposabiseni.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_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 10724 bytes
SHA-256: bdcd275d890dca902c5d8bf43a23b7fb75f34d2e9ec6f39e6e45dc6b3f311cc2
font_01_sfnt_off0000efe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 18576 bytes
SHA-256: 1dcca14c25ac51edd8d786df8cbf8756b5d99fa7ffa32dd2103b3563e89a91fe
font_02_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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