Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5f3e022fef326a…

MALICIOUS

PDF

83.3 KB Created: 2021-07-03 06:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97570a0aef19caf5e833d23a3fa3b0e7 SHA-1: a2a34ba6e8d2c3fce4d6de0c694562685608f2ef SHA-256: 0c5f3e022fef326a2e97df247d7294e2943bbde73a2a46ee942f15452d33daea
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The PDF's structure and the presence of multiple external URIs indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=copperplate+gothic+bold+font
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160971b0ae563a---tumenujefijimopazitog.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a8b5c6328---2365100686.pdf
    • http://tsmsaldature.it/userfiles/files/legirevagudebose.pdf
    • http://bendhorseride.com/userfiles/file/vuvitajafidapejikano.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/8llb3dg65a104gv828o5skms9o/43466996774.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873abdc6110---nugarolaxepememuwom.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/18a8f7f7fa0798dabb7b431941deb23a/wutegikudobupumaronuwevaw.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9fe783f28---nefifugobarenedesufigu.pdf
    • http://hkalc.com/userfiles/31946177428.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080629baea9c---zevoserubanapiset.pdf
    • https://blnk.eu/userfiles/files/mutalawapodewizabon.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/demixofuzibopozapos.pdf
    • http://www.jindatunnel.com/up_files/file/zupukubabijosunevofedeke.pdf
    • http://dui-antidote.com/images/userfiles/file/82086620964.pdf
    • http://mousike.it/img_ins/files/81588191577.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fad9aed794---rujuperoduxu.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6b830522c---83161916294.pdf
    • https://an-professional.ru/img/files/file/6597207611.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a609c153ad18df616f2ffb2d920e643f/3198211675.pdf
    • http://akcjonariusz.com/UserFiles/file/82329378248.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fffcb7664b2091cc3e58c2db35479afa/68882379236.pdf
    • https://chp-travel.ir/data/file/lilazodatilusogevotig.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/576185b7d04a2e39f87fa719154a440f/durezususutiki.pdf
    • 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_off0000de1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1F 16792 bytes
font_01_sfnt_off0000f636.bin
01d3e3e48c6cfa0c3726960c1be66ddf0a3025f7fc2aaf2c6919975a543bd9fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 10904 bytes
font_02_sfnt_off00010eee.bin
3ac0f4590dc8622af5abc188a319be29cc40737275b1c9a6eea3eca66da15daf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 18724 bytes