Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b85f61a023a05fa…

MALICIOUS

PDF

79.3 KB Created: 2021-07-17 13:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b7440cafd4c1f32aa1356ad08c1752e SHA-1: ab076a25933bbad1c18220b7fa4901a81aad7670 SHA-256: 8b85f61a023a05fa5b01458410d716ac5264bb54ead6e901513a7c7164b2a512
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple links on disposable or compromised hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b2ee965c---62121727083.pdf
    • https://llsindia.in/FCKeditor/file/88409309625.pdf
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/13697155841.pdf
    • http://magooferta.pl/uploads/fck/file/piwajevofodaxuzamafemiluf.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/irlp0rg5u10ppcs2tskccdeap0/11277180024.pdf
    • https://agatanorek.com/files/file/64948008077.pdf
    • https://nvsrolko.org/ckfinder/userfiles/files/suduwawopi.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f16c487380a4e4edca6033f848a8b5fb/tusoratitizok.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/22b0943p6dakk7kc7ovd8lkpq2/felezo.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/d3042fe6e5e9ccf2590b1acce3c35b4e/93248216865.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/d1d8c93132d0d3acb185fd0d8fc82f25/janadoremipavujuw.pdf
    • https://lavaecucebrescia.it/file/rurikolopiwixejufefod.pdf
    • https://rubenferro.com/userfiles/file/ximepupeze.pdf
    • http://www.herbertvanderbrugghen.nl/draft/kezapu.pdf
    • https://ajur.rest/uploads/userfiles/file/24699425239.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a45a9ca26b32716a98e24af0b738195e/tazibadedunovebemaloraju.pdf
    • http://rld-carbon.ru/file/kinesewurowovivaritapipir.pdf
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/tatisoniramutumawape.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afabb3048f8---lobulax.pdf
    • https://pointvirgule.ca/upload/editor/file/kunedaropifibapus.pdf
    • http://ehomeforeclosure.org/images/file/xurixa.pdf
    • http://budohurtsa.pl/userfiles/file/83150645548.pdf
    • https://associazionedynamica.it/uploads/file/dijikaxititesoxo.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/9349215152.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b898de25---74233764845.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=computer+control+system+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_off0000d412.bin
486f889b536155b16c66ed8ea1614feffc541b3f645e7849b9785c89e09c91b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 16508 bytes
font_01_sfnt_off0000fee7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 16792 bytes
font_02_sfnt_off000116fe.bin
6e2cb3366174e09991b93bd6b0770d6a168185c2399b7bf4dd89f6dbfc442c96
pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 10772 bytes