Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd70f75b72f7f7a…

MALICIOUS

PDF

98.3 KB Created: 2021-08-16 08:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92870c7f2a6e06fb10c9a75f18d2d240 SHA-1: d8b9c196d5afedd782adf12dbea78e8edbf5048e SHA-256: bbd70f75b72f7f7ae035fb5c306e5b878f6975883b70e3d12892a02d091e02bc
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and link farms, many pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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=amar+chitra+katha+krishna+pdf PDF link annotation
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/gj90hbik1k3msuik6lbnsir5td/42525348959.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f3400d176791cc7bdaf5932f8af46158/70352855642.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/kofagokamigimakibigid.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/obrf3psm9ddollpdu4qv6n42ph/kuwosexofuratome.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078be27f0c10---60961754071.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/kelimivajinabakup.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f3868b60c6---bifaso.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/m61r1gb9qcu5qns6odcj6m8emd/40607831523.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/e83iahncmkcobf2p16uthv1k33/boxepoxotaker.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/12517342833.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b6d50eda6---kagurez.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c388ee1d4---pusibilive.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa321cd922---70395583526.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/v1lijrf3ns1222knfnnmu1ojd5/38964278842.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f8a161c9129dc3da82b007dd1f88b49f/26218417638.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/262043218886.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/99900603842.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985e9c33fbc---99632526148.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118d7be21f71---tunajoju.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008369df7d0---26011234785.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d0bb9f1d1---69444079022.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da238559a---20611431179.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/71393353711.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/paban.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/jadepejewuponip.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_off00011e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 10660 bytes
SHA-256: 56d36f5ff4ea0e1130818b0bcc4998ce4e2949de205bfcf173e8956d7897db01
font_02_sfnt_off00014e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7E 16948 bytes
SHA-256: 8739cf7b5ea154fe15f457591767bc48ed8f757e0f0cb629711edbaa1b8e6c58

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