Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5563c674690635b…

MALICIOUS

PDF

106.0 KB Created: 2021-07-06 23:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: ee6c0c616351e539a40eaaf456161a70 SHA-1: 8f7b52fa5e98bf03bc83ec1d844ec4602d82bc56 SHA-256: b5563c674690635bceb944c74d2a6c729f8b6458c4b1b33c25df7b33a22c7f60
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a link farm used for distributing malware or facilitating phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://catamma.ru/uplcv?utm_term=david+committed+adultery+with PDF link annotation
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bc033a0a8ce---tedemaxaj.pdfIn PDF document text
    • https://aokman-drive.com/d/files/notaxilesugutatinagojomik.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f325839753---53222342894.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/632e87641d67f2c992db2faea4153b8a/vunit.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/1ruuhski86o1o0tm40ok7kureg/32971590152.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/71953605149.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/tafolozedezapitob.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/398d946e9a74ff1a34565dc9d5cdb8b6/wewoboninenite.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/po5gankapavlfs5f6bdo787hfo/lusaripilok.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ec29cb91b---zafoganudovabiwudedomo.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/df0gi8ofat8dmhpikv08bca9r1/somubibegajiluwawufur.pdfIn PDF document text
    • http://kasargod.net/uploads/file/naxamuferek.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/perove.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/jozijifolulekuxa.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbfd561da0---dofovelitirozularureza.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a7345d11---vepuguzora.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608110896b223---92470583211.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/80fc5b5eb695f6678e7f71ee35cac1f0/juraxonumipezuferatogenim.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a5e623a90---89416957058.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b9d3ac8dc---wovipenivisinotewedulora.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/s9i1ge4pd2i2s3ipigmjlhakab/98557468671.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857af9ae8bf---10180258082.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/85c344d97bc8eb9a833888b8fa885001/roronitugugifufap.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/likexuvasugedetadeg.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adb57d37052---wuwadumosu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b416fec8871---32093190944.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_off00013cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDE 10732 bytes
SHA-256: 753e0e0ab3b24ad91407d8f7d3e2d86fe51038ded63efbb9c8a98596681bb5fc
font_01_sfnt_off00015591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15591 17324 bytes
SHA-256: 217939d45d898817955dbbfc71f272fbd3bde0f2ce9d9de87e9353106b62aaf5
font_02_sfnt_off00018279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1