Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a839b3bd311da7…

MALICIOUS

PDF

82.7 KB Created: 2021-06-25 23:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec1cc7fc0e8e58687ff9a2f40ee18671 SHA-1: 517acbd393875d616bab5e203cf1756185b7d887 SHA-256: c2a839b3bd311da7883ddfac88048666ead6e0eba9e37abcc058b26c9d93f38a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing campaigns that leverage link farms to distribute malware or lead users to fraudulent sites. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5543be508---42495550734.pdf
    • https://avgdesign.com/userfiles/file/dizem.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe1c6aebc5---gimafupazisunezimevutapat.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a165d1ecb---sojufuma.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/076593f32fd4367686bd4641dcf921e6/13513634799.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761fea9773a---menukabipanogorixu.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160946479d015c---59556346599.pdf
    • http://geyikkimya.com/userfiles/upload/file/sidib.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73128552a---gigexegul.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c669ab7d604---xiziviniz.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/bo6685k2g467ak0l08i6bkg1lj/80615922791.pdf
    • https://menu2uplus.com/images/file/vipitigifafufe.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607849ddaace6---2907334831.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/fadegakuvipovom.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/0c5ejh5hcn1ihlf1pg2a90p0n0/gomepotobaxowugipegesoxon.pdf
    • http://www.europesolidaire.eu/userfiles/files/13926202832.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a76e9ca06---90859797077.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/81881535745.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/c5ec68ed62738fd201f0ad14db0568d8/mepesanafagujobobumor.pdf
    • http://adveotec.com/img/file/jazemosorugagaveve.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a8d0d9549---kizejajibokokalexepego.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/wezugutajatin.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/lc3k1nm1iuvjk4aeu5hhsl2n14/sidobolalug.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+flying+boots+in+minecraft
    • 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_off0000dbbb.bin
1493a5e7fc41a5dd3977b7e81fd993b6f8a9a92138404836f6aa42a8a68d5a68
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 17344 bytes
font_01_sfnt_off000109a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 16792 bytes
font_02_sfnt_off000121b7.bin
927f838b6d24caee5266378aaae2e2ec468d6b9d8e2ab967220edbea3b2d88ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x121B7 11104 bytes