Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fb370c057c229b…

MALICIOUS

PDF

112.4 KB Created: 2021-06-25 19:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ea13d25394f8255e3b2fa05b79db528 SHA-1: 95e2f72179872bf48b10ae61acf871258c32affe SHA-256: 82fb370c057c229b97a5ffd6e46c58ae01291418c273abd3180d15a86f98a30e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS upload storage, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of a link farm on compromised sites is a common tactic for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/a1437b10ddf1e3f710ba50416ccbba80/7034873781.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3d86a38a9d3bcf1c567440cc9adcfe9b/96080362878.pdf
    • http://myxroad.com/upload/userfiles/file///bagawewafenolulenebenoti.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/lafiwavuzitapafunek.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7c89d01dd---64521688221.pdf
    • http://www.annaleehuber.com/content_files/file/kolutezoxexokewatogofe.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca87ed77ed---80379778546.pdf
    • http://jun-travel.com/userfiles/file/zowopifugamimuz.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/sokav.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/zewegofowibifelobefen.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/3a04daa4d108cf6b63cd6a5679d053bf/xasuvaligarawepugufikibe.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e8c6a533f---38974100530.pdf
    • http://ajisushionline.com/uploads/files/magiburizax.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093b10c07bd3---zugipimufibodiroropegak.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce31bda030e---fumisime.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/95fbe975fb67e17d561891b4a82c3999/xorusigefegetozuwuzunifi.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e05cd5720---babetuxijanojik.pdf
    • http://alexhoffordphotography.com/temp/files/file/14221883387.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/42177051565.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c899a8a9fcf---30550091680.pdf
    • http://jrmhandling.nl/upload/file/6638578024.pdf
    • http://anthonyvienna.com/sites/default/files/file/10538483294.pdf
    • http://ottotech.center/userfiles/file/nesarojo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=son+of+man+meaning+in+the+bible
    • 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_off00013728.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13728 16792 bytes
font_01_sfnt_off00014f39.bin
78518a38ec0ae81f6e92b4d8704a83459a6664a6b1428182d610d5b291d38329
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F39 16864 bytes
font_02_sfnt_off00016769.bin
4912f12b5630bda93634e042b4634abb498870317a2cccf75a6c1a6de8a52cd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x16769 20528 bytes
font_03_sfnt_off00019b7f.bin
f48333d05eeeacd2511a0732aa00173a1b6419b797ee10092e5259e09780896e
pdf-font-stream PDF embedded font (sfnt) at offset 0x19B7F 10608 bytes