Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d22482b1aa03b3…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 08:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa9bd812d6631d536e2e54af74be13d5 SHA-1: e14587a15244eb9330276c121bd5ae6eaae95ca8 SHA-256: f9d22482b1aa03b3d7c89b714889f492eaee52f7b8f90bf4160b7115c0d3511e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for distributing malicious content or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c1f3690542f56d7acb5f01313359f8a8/33165447916.pdf
    • http://myucmas.com/userfiles/file/87791053791.pdf
    • http://merwepizza.com/upload/file/84646469396.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b811b9a1dc---38027057206.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/49b06a92099def0f8f8d0090adf654e9/40343843920.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7533a67ca---kewokimu.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fa5865e2f---17090662615.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/589ba03388915dc28c0da63c7ee1be29/daxiniludikogazi.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cdb9da1e4---98384355012.pdf
    • http://beijingbeat.com/contents//files/72752435517.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/svfjm6ognd2n81pd0qcapjdni7/39877139263.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cbbd961d2---11182196525.pdf
    • http://presssimayeshahr.ir/pic/file/sezinozag.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/76465232220.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160afa67d736c1---lunogulebizuguvisanevuwe.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/87378523568.pdf
    • https://irrisyst.eu/files/file/5435079125.pdf
    • http://luberoff.com/userfiles/file/31272839925.pdf
    • https://protradingindia.net/userfiles/file/11253167761.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cfb7a1f44---dutizizosexavavagavero.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70e4d4bb9---xivotifegafafa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=crowdstrike+stock+quote
    • 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_off0000ef75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 16792 bytes
font_01_sfnt_off00010787.bin
abe5c0e86b21e211c033b4bbc7d4c9bd2b7e3b1556a5f9c05ad3baf04c2b4b61
pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 17720 bytes
font_02_sfnt_off00013625.bin
0fc1956fe049c596d414cec203775a3702ad2d2da1aa6539206f65a0c7b69fee
pdf-font-stream PDF embedded font (sfnt) at offset 0x13625 10504 bytes