Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec1e673683f0e0a…

MALICIOUS

PDF

85.4 KB Created: 2021-06-30 21:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 975d9b80ad0e8282a4bf1090dc83d2c6 SHA-1: 23814a4a91f9a0019d9c58d0b50ad1daf9f87df9 SHA-256: eec1e673683f0e0a08e7aa3b2c251309b1247df1b17a18d4b84fe8242e32a3c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The presence of embedded URLs and the nature of the heuristics suggest the primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=replication+of+dna+is+said+to+be+semiconservative+because
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0e345b03---56485472133.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72acb1aaca---futorotigoz.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/1d022f336a241bfb4b56e06a95960fc5/davojawomubo.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56b2df33253fb50d4ecc76ec24f48f3d/vulagodexifawatiwuroxuz.pdf
    • http://robalton.es/Albums/images/file///79190132034.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0dp4at3vv2h7jm7v3goteeb3ku/4176208364.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6bbd8d1b7e---33270614108.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/emmvir20qaqhpkddf8i1ulo85e/53390490193.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/j4t2bgnuhsv8qb5lgo55t12eh4/72792448400.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a423f9b5279---59393828296.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9de0a0511---66924501837.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089a0e1ccfc7---79576683159.pdf
    • https://candbco.com/ckfinder/userfiles/files/juzibopisonox.pdf
    • https://luminex.pl/upload/file/mafexur.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0e77b9df0e09bfc8cd19cce95d0d5965/81533855599.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b0e1f11808c1f703c94df113c10852ed/18875997172.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754db06f1ed---kitoxipafavawuretibunug.pdf
    • https://accuratesearch.com/userfiles/file/maduwegejinowupisovanigi.pdf
    • http://fxmeat.com/upload/file/5fd9e9779446f54edcdc43d676ba5078.pdf
    • https://healthmatters.me/userfiles/file/jofabegapirozajemu.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d81580c96d37263dd074ebd0aeecce21/ribunexexiwuwo.pdf
    • https://houstoncoinshow.org/FCKeditor/file/88254644768.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ec82kfkdk3ktpjtvfth8hdbfs2/98540272264.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zemizenekirowemesibokav.pdf
    • http://kowel.com/ckfinder/userfiles/files/1622701621.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_off0000e9c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 16792 bytes
font_01_sfnt_off000101de.bin
7dd61c2276cef930d748ec9b64bf97134333c1cec8426ea08d36c310dc89a8cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 11132 bytes
font_02_sfnt_off00011ba7.bin
11ba8a6c02aedfd1962ee8b5e346ceb97d4cf181532b324e0e86fb3a8a71e2dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA7 16240 bytes