Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c4490411f97951…

MALICIOUS

PDF

74.3 KB Created: 2021-06-28 09:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8817f522ec87cb260968898041135884 SHA-1: a9b21884b86fdb126fc73933e3f23ce3f8cc41b4 SHA-256: 09c4490411f979519d642bb25d699c9040671ca8adcd25dd410abff3b8b8720c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4973107f2---47587788542.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dd6b71b7a---91171073448.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/46c37c110b3ffa6429caad5d5a7d9d1f/ximun.pdf
    • http://rcp-ranstadt.us/files/834152764.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fd2dd2b7---wekixemivuripime.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bb38f0891ee---gagikozanowigipesepume.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a55dc555454---47125316862.pdf
    • https://actor-conseil.com/files/file/96155643935.pdf
    • https://inverpalmas.site/aym_image/files/51504751777.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccc8712cb5---bisimiguxoxudasixejo.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9d2328061---21179059132.pdf
    • http://adveotec.com/img/file/90858952785.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc33a67be0---80269401472.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e5195294---petudekawegezolekutola.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3a6a250cd---94609836587.pdf
    • https://poolpoint.be/uploads/file/fapekarakabikakukil.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa1a8b7d6---murivujik.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/3606d2f7dde566d62236c21c2efc7cc9/waropisikedex.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160747b9d33a2f---xiruxosovifo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+complete+guide+to+academic+reading+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_off0000bbcb.bin
8db9d9a961d781ed7ea5d14a9b52eea92cc842dbc2fa7b708c010142393e2499
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCB 10960 bytes
font_01_sfnt_off0000d4cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 16792 bytes
font_02_sfnt_off0000ecdd.bin
232cd56c626f25f2a27d4ab4955471486849d79b40c1032498f76e34318a317b
pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 21156 bytes