Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6ddf8d9b99075f…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 20:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6ff862352ed1425a604694c8fdd3a553 SHA-1: 4c3dbf5d6786834abb5b10bcf5f1f252a89c6af3 SHA-256: fb6ddf8d9b99075f9a95c22ae1f1825f146e94649d6878e934235841acb48452
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://lapakunited.com/contents//files/77180129535.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/r2lgdl9ifhr8ib3d1ng4a4qu49/89313034217.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9704325e80---doxomilefofesopore.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/cde8a35d1a3638c29182eabb1760ccd3/66859017588.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/49425725745.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/2c72om4ksj1jjvsccjff35ehro/punoxufawopibalago.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/0bb2f9dfeb63a6d34c9643955abd4dda/35997519335.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/16524752847.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8b99f8760ea6efde55526d1d428bdf15/dovep.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/de61eda1890913d5f8d5deaee086542a/47722322536.pdfIn PDF document text
    • http://becucci.it/userfiles/files/12474011891.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/79356581165.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/duguxivomebemuxo.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a85cb199---48489708736.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/c97tjkpihicjilco0s3m9sfj82/kadalerekizinege.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/dofawosigaw.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kozuluverexi.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210807215110.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607485a41b575---falipirudif.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849c68b1f79---romaxazulonumelukekag.pdfIn PDF document text
    • http://cycling-software.com/files/file/96525976989.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/4a038b144493ddbbec2416d8993229ed/majodiviketuwefuxa.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/80f7bffcddd63656e4165b17a9c26e91/kezorerapisevuvotamemisi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/xulewepanipimeninuru.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/zodoseteketefubivesuxex.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/54232574843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=deep+in+my+heart+quotesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 10832 bytes
SHA-256: 8f1005030565358f4e91de81132a06d95d9262633c6c4fced8ec5e8f9db57993
font_01_sfnt_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 18340 bytes
SHA-256: 599b8768994767f09453d5a687a57d201f0459c89f383cc7a6cd1e2924572354
font_02_sfnt_off000135f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1