Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cccb24d3d676b96…

MALICIOUS

PDF

85.4 KB Created: 2021-07-07 20:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 38496b6fe385a6b04cebc01b3d0f23d3 SHA-1: 4f296cb93eb3224af173d98ccc26c0c51538e30c SHA-256: 7cccb24d3d676b9663d99d0b4739e1e6623b845f8ff0b72e144dbe94f4a7ade9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crewmak.ru/uplcv?utm_term=solvang+to+cambria PDF link annotation
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609de658d6098---wiwigivibufugezonovemese.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/tvf7glr7eh184115euclbq9070/domafeb.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4p2kfehvksfmf9euipht02s396/tixoka.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/af422b41e79dde43ea9e74cef7824b1d/17499695311.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/50828756425.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/vokitaba.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/1324406915.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/sanojidevek.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/bodiv.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/jexixovubimale.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/355d2ba528c5fea7e1f76d03154f24b8/6456271252.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/vajelalubedolutunirid.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160877ceef23e3---10098907162.pdfIn PDF document text
    • http://greenbrier101.com/userimages/noluje.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/zexenunuverug.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85bee2203a---ladivabodevodegu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c17ebc8ba68---rezedu.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a26f3e4ae8983fbdf1d7ed659729c52b/11736312245.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/64169814983.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a79921c844b5113f129837d47392658d/93017839367.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/refukukelorogulugaraxid.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5201c55e4---91367883944.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_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 17116 bytes
SHA-256: 2d1c554ff07425a3ebabd2b1d2c084ebabd1e8ce9a4f6f1fbb1881b32c40775b
font_01_sfnt_off000118ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 10552 bytes
SHA-256: 015efc8ea28bd7ae9ebf0387e97a0b38ce804fa736eac67ca31a6b047c20f420
font_02_sfnt_off000130bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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