Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1cbef9a9a00397…

MALICIOUS

PDF

86.8 KB Created: 2021-07-01 10:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5483891289e4c79b0c5bd9edb875561 SHA-1: eacc2fe76bbc2d34d6be6a8d1c53c3c79cb075d6 SHA-256: cc1cbef9a9a00397ab9b1292d697a202f3e436fd97d4d7f620d5996df30379d0
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa0d32ffd3---48682641133.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacc992ce2---nelomarom.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/45363ff9166182e292c863dc46ad2a69/wonutif.pdf
    • http://newo.ru/files/files/62885036537.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/0tutrerfervhssqme942kl6vsp/jofetidel.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8d33dedae---31442080267.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5ebf2d4c0355b497cde3a88fc7e440cb/58599905736.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1631a08b1---waxozojafugomumite.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2v48in0umdfodj87jm80fl4dt6/tukatibeveposuropabe.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/63dd78b7050610b9c513a07123e576ec/vomalulubedokop.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58f77404cf---dojafomirekibir.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095df2676c77---16963984135.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/966ff04ffa3000fcbfd619bd835732d5/wekusir.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d78b9def---dolimupavegoze.pdf
    • http://soldearenales.com/galeria/files/feliresilaxazu.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3041de1aff---falapurewe.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/4d3ea72b6cf4a165589f2f6fee8d146f/sexilesidovazuselubefela.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071732622592---35779505371.pdf
    • https://sapporopools.com/contents//files/72381095854.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f46ce62cbe---71493997917.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1127cb4e5078e85edd811a1f6fb68665/36338225528.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/99fa44a2da56edf3e1e286e0eef0a1a2/xenunidaji.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/g6msa59v568jhn94mfhf1on9sp/28606175241.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=lakeview+hotel+mackinac
    • https://mediaget.com/userfiles/files/82804232425.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f295.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 16792 bytes
font_01_sfnt_off00010aa7.bin
cbb7de413f2229cd8eb0afddb4e39d8dd68916a4fdfc741a4049a01b43bf4c5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 16848 bytes
font_02_sfnt_off0001367b.bin
abe097bc403ca5f27786d4bfbac7b109755343abf91af0f327dca57fa6dda62a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1367B 10428 bytes