Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5904ec54c8e4da…

MALICIOUS

PDF

88.4 KB Created: 2021-07-09 00:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86ffc2721c56858caf55bf8e1f7acb93 SHA-1: e21ae188a89229cacc7363722d8ac2452aef2918 SHA-256: dc5904ec54c8e4da6d59fdd24389f1178f5a6b06c7489c219c5433be79b455d1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using disposable or compromised hosting to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/df8c202811dd860a51475b76d7f067b4/93958067234.pdf
    • https://cowichanseniors.ca/userfiles/file/jewevitopusanojowa.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d7a9b54d---zofidusugawabavorav.pdf
    • https://ubranni.com/uploader/files/6498482806.pdf
    • https://atraba-holding.com/userfiles/file/93515327512.pdf
    • http://haki.vn/uploads/files/vavegabaniboz.pdf
    • http://flygarfield.net/userfiles/file/xuvuwad.pdf
    • https://lordoptika.hu/files/files/88213816056.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e68b70a5---36519426938.pdf
    • http://ktcz.eu/files/files/22511824438.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/60ecb36ac50241a4ef248365f22778c7/1913300189.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/47126421682.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfceec09f90---75082051523.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c6048de9---34232325079.pdf
    • https://atcotourismtravel.com/userfiles/file/vefivojasiparodironafuma.pdf
    • http://contextuae.com/resimler/files/ziresujoxuvuxufo.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/66a5693ddd910900bc2a8bd7bb07c0f0/51962920564.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b0d8d401---rakizowibe.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc675a6e651---jatesixexevuzijabibitatal.pdf
    • http://anthonyvienna.com/sites/default/files/file/31930261427.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fbf8bf6db---widedinatuka.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/surulazofazaxutokigufuj.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a369e56d78---mizoru.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9f8775ddbf17aec64ad76ece5754eb47/32450175492.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf83847aca---ferezulomel.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f2e60c855---82932144353.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=deputy+manager+meaning
    • 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_off0000f495.bin
5b3a22df91090ce494ce357ef7f6c2e3be7ac86b97cf202451b477ab647e5ec5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 10476 bytes
font_01_sfnt_off00010c64.bin
0972725ef289d04dfd259e1440dda36e6893c0934627ddb43b3f93cfc179ed81
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 18124 bytes
font_02_sfnt_off00013c25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C25 16792 bytes