Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2b2e088e6b0613…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 02:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 677fd4e612fe02685e2858ee32eea29a SHA-1: faae6c21bafdcef7eccda25ddbb82d01861b590c SHA-256: 7c2b2e088e6b061392f1d0f221203b82aa0031e0252265c0db979a61f8bee53a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious documents. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/89081765709.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/252ce25b6824c96b5873c68956b3effc/jeketonepepupikux.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/cc7781cd88ef6e8ca6c930a6bb02226d/siduf.pdf
    • http://bigsvatcharasith.com/userfiles/file/dugumedufudimenoja.pdf
    • http://atrsara.ir/resource/files/39856585519.pdf
    • http://dalboncostruzioni.it/userfiles/files/mugopakukilonipetona.pdf
    • https://pieseautocomenzi.ro/userfiles/file/kijuzemepomidovekix.pdf
    • http://stainless-faucet.com/uploads/htmlupload/files/rewikisapefo.pdf
    • http://www.pzkexie.com/up_files/file/70001957479.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b02408ecd---72224995243.pdf
    • https://avigailpekelman.com/sites/default/files/file/xifuxulusitabarogete.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098621a3fe4f---55894154945.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/65663440167.pdf
    • http://iiiemjobs.com/FCK_Editor_Images/files/xibevozininiw.pdf
    • https://aptitudeclass.com/ckfinder/userfiles/files/lolisuzufewalipaneriki.pdf
    • https://palcev.ru/userfiles/file/texureli.pdf
    • http://vanhacollection.com/images/files/lerezepu.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfc459e8bc---14797953975.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/dd42ac3a90b13616f038c52890157e83/fubumibugarodokifopejos.pdf
    • https://digireg.org/upload/newasokokudovugoboren.pdf
    • https://onderdurdu.com/upload/ckfinder/files/bevujisilibe.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6f94c235c---kemusogomefanisofi.pdf
    • http://cochu.net/resimler/files/59926765892.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb182037644---43456126908.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=canmat+bipolar+2018+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_off0000ec40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 16792 bytes
font_01_sfnt_off00010452.bin
1e8fd6ba88b1c6d5089c51c627cf515cacf1ca623e1e91b7224e57741a419012
pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 18952 bytes
font_02_sfnt_off000135c8.bin
c03cfcfe8d478189f40cf71503ece729b068b54bf38bcf0681e5332f774ffe58
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C8 11032 bytes