Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e816d34eb8a068…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 22:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11e5df9288b5addec48c177098199001 SHA-1: de338efa20e3b60e892ed299b71aca335cdffec1 SHA-256: 58e816d34eb8a0688b24d094f69a883aa34000f1824a541bedc22703cd69a232
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS uploads. ClamAV detected it as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The document body is unreadable, but the heuristics strongly suggest a malicious intent related to phishing or malware distribution through a network of linked sites.

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://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090607111cc2---59887843971.pdf
    • http://upoart.com/ckfinder/userfiles/files/golidosag.pdf
    • http://uniquecharacters.com/upload/files/zekamepa.pdf
    • http://k1a.ru/images/files/file/biwaxesikefo.pdf
    • http://amexeuro.com/an3_Uploads/file/35824034558.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/4eb2df7952fc4066a4f50aa894fa4a17/30203337218.pdf
    • http://sanruou.com/app/webroot/uploads/files/gomamuvimijuxolag.pdf
    • http://theonejsc.com/userfiles/file/navatotan.pdf
    • http://didopack.com/files/putobefedobijivasan.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/epc2b2beaohdoutr34lonr0go3/33800171045.pdf
    • http://americasbestmanassas.com/uploads/files/28879558673.pdf
    • http://visit-pune.com/userfiles/file/41553429746.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/74129353691.pdf
    • http://cnex.cc/images/blog//file/88723913666.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/7h0268ivbvqc0mrgs3u2qsma3r/87571590045.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c084d17bc84---labib.pdf
    • https://aradmissions.com/ci/userfiles/files/fonapagawisemu.pdf
    • https://drvishweshwari.in/userfiles/file/popasiledulumanuriras.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b9407fe1---juxetajinonatabopam.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/kds544fjgite2b6pmvt1h27545/4372417667.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609534c5d76d7---kadinolifesunaxovas.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/hh2ihcrv56j2o4agh8kq0e4s93/86492655914.pdf
    • https://people11people.gr/uploads/File/78888929993.pdf
    • http://mmcaana.com/clients/29274/File/kopivi.pdf
    • http://bilmatbasim.com/userfiles/file/71675387346.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tamil+folk+songs+for+singing+competition
    • 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_off0000eb4b.bin
d04c01da7a4d82f7dbcdf7127e909f5c87edfd333eebc9fcc8a148dc97745c0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 16836 bytes
font_01_sfnt_off0001171b.bin
26e4cb019070285c2784835cfaf011a724c518ad014857bd4a8862c565977dc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171B 10880 bytes
font_02_sfnt_off0001304c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1304C 16792 bytes