Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4bff18dfea9836…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 23:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 969315a3a6ce53a6ad773546d9213566 SHA-1: 6d22747d76f0e4c3eb343730a74de6dd842bc1ac SHA-256: df4bff18dfea983613505977aaec32673916909748f5476dba7554aae6bb4f36
156 Risk Score

Malware Insights

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

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 WordPress sites and disposable hosting, likely intended to lure users into clicking malicious links. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=ducati+panigale+1199+owners+manual PDF link annotation
    • https://ksuskalology.com/images/file/juzij.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec17a45e9a---6675238368.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/rizokiroxara.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/84a78a8912293d496c213a76508cda7d/jomimubemub.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/jalulosasa.pdfIn PDF document text
    • http://nkland.org/userfiles/files/xuxumenibigo.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/e51e36292381d832dfc801cfef20fc39/digojurekalow.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/60894983959.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/zeduxebexotigexetebog.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f1c981ce3---27186443600.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/3828479280.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/10285357209.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/65910108694.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b32f6a372be---gixonazafenojododakegos.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/96346064384.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725c659863c---31620481544.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/40869490184.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/vefibabepogexewofokeboxi.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/jumur.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/422r4n72vq9kt14lvlpvhdrli3/22849390436.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/zudadif.pdfIn PDF document text
    • https://bamor.org/userfiles/file/sawubimatuxi.pdfIn PDF document text
    • 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_off0000dbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 11124 bytes
SHA-256: c3736b581ac0f871e5ddc49cd5f6aa196804e7e0cf12899bd57f7d85396b1d3d
font_01_sfnt_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 18112 bytes
SHA-256: 48b5f22f18f21a56efd7d600eeba924797b25eb449461d2d6842ca92fe96e813
font_02_sfnt_off00012549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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