Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ee30a6d37d703b…

MALICIOUS

PDF

88.0 KB Created: 2021-06-25 22:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f64f38979443eb6352b61d2398e9a69 SHA-1: c0f9785b4e8f424e8f24a3d639080c5bc8f7ce6a SHA-256: 25ee30a6d37d703b2d143936f5ef4268efb14ede3eac64e5a552b80e6a956c8f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated high maliciousness. Heuristics identified it as a link farm pointing to multiple distinct hosts, many of which are compromised WordPress installations. The embedded URLs suggest an attempt to lure users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aba03c712c9---56234261246.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160915117cfdd8---wafuvibukijasijaru.pdf
    • http://albino-pitti.com/pub_img/file/silafarivibisig.pdf
    • http://tubietelbar.hu/uploadfile/43850101426.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af83fd10c5a---54895737171.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a79cc0aeb0f---pimarakudipogofun.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e77525d569---95177868859.pdf
    • http://escqatar.com/uploads/userfiles/file/file/33739330625.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/71e1145adec2c9ae2a81be45fe3453dc/wetuwakesobenirovu.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6ecdpgtk0kidba7bghlol7teqs/13741640173.pdf
    • http://botosani.ro/img/uploads/file/jowapeb.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/jarimunu.pdf
    • http://biotledlight.com/userfiles/file///lipiwadofugamaziradomaxi.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acda51175e1---62193594682.pdf
    • http://j1medical.com/uploaded/file/32178326847.pdf
    • https://chungcungoaigiao.net/uploads/files/61403666646.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f92b0b71ae0b58b085e1a6fd16436071/mivubavadinowegorava.pdf
    • http://jl-vacuum.com/upload/files/sakavijixuzunira.pdf
    • http://ingenermarket.ru/userfiles/50467231865.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/dd26d863d8dc6202010c2613bfa1192f/53393044845.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aedc58226b---27928523213.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ed77cf322---genozes.pdf
    • https://icbacademy.com/upload/files/25977113596.pdf
    • http://princeverma.in/uploads/files/funesazagiboxume.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0b64382d---88337824164.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=first+grade+math+review+worksheets
    • 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_off0000efd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 16792 bytes
font_01_sfnt_off000107ef.bin
b9b4db6bd498d06c5f16a135d431c9757f7c67d45e03e97f73c8f023e175a41f
pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 10764 bytes
font_02_sfnt_off00012096.bin
8a7d63989fdeafeff4dfb9755229e07b5258e43c3db306e1b45c7eea8bfdefaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 19408 bytes