Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9203e87b241bb0…

MALICIOUS

PDF

78.0 KB Created: 2021-09-22 10:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 338480ef620475bf3ba83899b04d30ce SHA-1: 04fc920fe5162e16057b2706266e169afe813f34 SHA-256: 9c9203e87b241bb03446d17319cecd76fd61180e159d878a9bb722ec14306b1a
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 compromised WordPress upload directories and disposable hosting sites, indicating a phishing or malware distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://rais.bg/uploads/file/28093925674.pdf
    • http://ogcdc.org/uploads/ck_upload/files/67037310435.pdf
    • https://dom-titan.rs/files/fevofelazamitafomubege.pdf
    • http://abwjefferson.com/uploads/files/33373183018.pdf
    • http://kool-house.com/upload/editor/file/rijabuxati.pdf
    • https://travelworld.ro/userfiles/file/70186747975.pdf
    • http://cassotech.nl/site/data/ws/files/83048674301.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa3d7180d---92986004398.pdf
    • http://cbcom.eu/ressource/site-image/files/5644975544.pdf
    • http://dienlanhlongan.com/upload/files/juweno.pdf
    • http://playoz.com/ckfinder/userfiles/files/melororerilori.pdf
    • http://gruppocreta.com/userfiles/files/juxofogives.pdf
    • http://heatherjansch.com/ckfinder/userfiles/files/83515280371.pdf
    • http://csc0351.com/userfiles/file/20210906010638_3o1ke8.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4c2054b409f17b6858b7409d6c761aef/36911990453.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb2c8503f---zonoxojarisuwun.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399928aa10f---nuguvemamakorotep.pdf
    • https://zegaoyun.com/calisma2/files/uploads/dugitoz.pdf
    • http://gz-chengeng.com/uploadfile/files/wasumedarurinonutoxapude.pdf
    • http://js-space.de/userfiles/file/82576204736.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/07s6tcj23egifqr1t652s84626/95786501008.pdf
    • https://coffeetuanvang.com/Images_upload/files/11505099015.pdf
    • https://wronba.pl/uploads/wysiwyg/file/koguz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=love+romantic+shayari+for+gf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b311.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB311 16792 bytes
font_01_sfnt_off0000cb23.bin
96e657d6d86620d3e31299bc93d9672f0313c5ee32500397cd234ddf4bca983a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 19000 bytes
font_02_sfnt_off0000fb5f.bin
4acba073e07e0102441fa9ad3c88e363765f8fa9eb5af5185cf5c6e7c334efe6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 10876 bytes
font_03_sfnt_off0001145c.bin
e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 16232 bytes