Malicious PDF — malware analysis report

Static analysis result for SHA-256 3775fcbcf56f0b16…

MALICIOUS

PDF

80.0 KB Created: 2021-07-06 15:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2a801c87f1bc44770e43b7b1f5740ba SHA-1: e7259c70b3125d7577f77e09b3839c95e97f00da SHA-256: 3775fcbcf56f0b163b0e4d355f7204d14ff63f12a5fff825af22f5fe2afbfdc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://haps.company/wp-content/plugins/super-forms/uploads/php/files/blrubnckr5kb5ndm52d4f8sj74/tomug.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608531faba092---vosugikevojoxarusirer.pdf
    • http://m2m2design.com/userfiles/kuxulimusi.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef35071d3c---55054275461.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/cd86c4d400da76ff5de528444fb09493/52924339759.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/14ac86e2b1a0d31f075ea25d8a2df4e3/xubanojagavuxiforimu.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/difiru.pdf
    • https://bkht.vn/userfiles/file/27410218238.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6550498f5d14f8867645094d437f8214/2093368095.pdf
    • http://benhvientantao.com/img_duhoc/files/votulijidu.pdf
    • http://avision-italia.com/userfiles/files/71290547687.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a5287341a---38123735077.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/samj53387ikeaboj6kai9v3oa0/22078965920.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9802134fe---vawumisajerudezafebu.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b14f7d9765547774330797543645618/85087637296.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722f8b15582---30907900814.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609585365a0f4---60386392201.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/5e6e1248e2d51da04d30b23371c4a075/36779194740.pdf
    • http://englandmatchshirts.com/assets/file/gabezakowo.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/cb714e6ada1f2f6a51cbab8b4d4fcf4d/detolivudetinin.pdf
    • http://krajinar.cz/soubory/files/sasile.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/9d19hi0id9j56t9pjqecfjl31c/16262717944.pdf
    • http://mariopresto.pl/userfiles/file/wafapatipipodokosexeriler.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/7efdbe081bd5aa1f3c62c298084f65d4/40853704382.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da9ea9b73f9---kavotemozupapox.pdf
    • http://christschoolblr.in/userfiles/file/55146326053.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=drivers+license+psd+free
    • 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_off0000d8f3.bin
2a276571a4904afc19b17f6e5f411d92308a7c31e2a7feecfc79abad7bc6a53d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 10300 bytes
font_01_sfnt_off0000f03a.bin
0d64ed463b65b71bbf1a4d1e5f4607bf352935c8a65ae2b3226a9b19c4f45aaa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 16556 bytes
font_02_sfnt_off00011abe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABE 16792 bytes