Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9c8f7686f10f06…

MALICIOUS

PDF

92.4 KB Created: 2021-08-03 09:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b5a746c3d1aefb59ab5297d30da8c33 SHA-1: b11abc31a93c8fd0aea17ddcbe46e01838e06fff SHA-256: 1e9c8f7686f10f064e441f7a49b262f444cd3ff2455f33f4c2426a03478d5457
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification confirm the malicious nature of the file, suggesting it's used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://oniceh.ru/uplcv?utm_term=size+guide+scott+bikes PDF link annotation
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ff535a5a---sirudefa.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b41fb52c29---fomirixexixugozasimenob.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/99ed8b3cf59883f83e536677204c3da6/75733697046.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2502fa7b505c28e31cd02536fa66b165/romomirexapolivemo.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/42322333847.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/midonerusegopuwaxa.pdfIn PDF document text
    • https://cecprint.com/images/file/95815079312.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a3377f11e---20780470628.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/64201812928.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0c358658fe341c3103051cce3a24330/79879226964.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c784033b9---64917512484.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aeace81e6---levifotadutuzeze.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/41284408935.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/84959880554.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/91761644343.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/50752112471.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/obqdgn97tmtk62859nct1qtp02/botazotixax.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e4ebb7a018f26fc26affae5f289c3952/94608781517.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160756e2ec291d---4367796715.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/nijomupimovijitageluriwa.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/zezijifigumafogukezeduzi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e534b6ecb---bomipekofafebulul.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/897430310be2f40a73fd01de3929c4e4/65894999173.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078323beaf89---86618396327.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/jo3mqre4ou2stgmabfdoa9d8d1/mukexipigurab.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/fowekubuzujidilametu.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_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 10600 bytes
SHA-256: e3cdcca8379526e0081aa0e747f2789c46228132982e305a873014c8557f9ca2
font_01_sfnt_off00011d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13552 16788 bytes
SHA-256: 1d8e68df8e3772f6c6c881f273544e50bdf8c8aa42709e32754806fad651f55b