Malicious PDF — malware analysis report

Static analysis result for SHA-256 af707e69de1f0d9b…

MALICIOUS

PDF

89.2 KB Created: 2021-07-01 20:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9750864f2be6fd812779634d2d7a1cb SHA-1: 9c2548de6620d3116cd673293fa00252e9ca68da SHA-256: af707e69de1f0d9b486b1146a9451e63d066ec7a8be29c5f54e771a92196fb3d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting. The primary purpose appears to be directing users to external resources, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/86c9c3a200f39f960788beca0aa68c8a/71386413041.pdf
    • https://profix.fr/ckfinder/userfiles/files/17856384331.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ssc2h2fl5v3kld8fgihvbjdpm0/koxivajapoposewexi.pdf
    • http://zartmobilia.com/userfiles/file/20210615171923.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/erlfbiksu7eh517q7aqof0i1bc/80927409428.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/866eeb8c9b6a6be729dbdfcc39278629/zofofaredutebo.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9c12d210---43738584485.pdf
    • https://haidangpc.com/contents/files/zulowudemokowa.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0e442994e224417ad790ad45490cf7b4/ruxapaniwogegubamedob.pdf
    • http://jingluo.net/uploadfiles/files/93322895878.pdf
    • http://fine-cottage.ru/userfiles/file/80216032790.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/nn14ebv5va8ra2kmb3k69tp5ee/90524043125.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8314c49ddf---vunaxozejofaw.pdf
    • http://jarosi.hu/files/file/41807325979.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/6ce1f368eb4f701722404b2d7c74a62e/48188568422.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502073720493831.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886530c27d1---91866175795.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hmbllv3h9mh5v3alrti8l0u5i7/gomavedugenivopamusewane.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/3007259634.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/520d7f97f73aaf56dd1fd9c9506c6d35/26423761065.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gmbf2341vb34t42a1pk1i91l66/60228316958.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/drmevleooegd59r79ppkfk7and/feribolega.pdf
    • https://kovosluzba-praha.cz/res/file/30112931849.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f95558df83---fugunezupubitiganef.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=insertion+sort+time+complexity+worst+case
    • 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_off0000f681.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 16792 bytes
font_01_sfnt_off00010e93.bin
0370c3a54e9c57cb63c3fb9070f99115c1ccf4226e7f53100b9793bd0c538355
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 18196 bytes
font_02_sfnt_off00013e59.bin
369ac97f4817bc2616f0220e888633e2eea8c55d84a915793cd12cd59444731c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E59 10788 bytes