Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8128a199cd60785…

MALICIOUS

PDF

74.7 KB Created: 2021-06-28 03:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a3d8aa45e10d07309bbd16acc1a0cd85 SHA-1: 7b4183df20b4a05cfeda38254a2d2c00111a05c2 SHA-256: e8128a199cd6078539a7909b09ad27e4150c422c6799498d4f1f4130588cede9
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many external URIs pointing to potentially compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document body is unreadable, but the presence of numerous links to PDF files on various domains suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://abpaluso.com/upload/file/tedonenelure.pdf In PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/86674296580.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/43647051992.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/5fbed2ada80db9921729f38953028efa/wogumusonevagezigix.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/93lfdkltobbou4cmo9v71r29lh/71421898590.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607495e4deed0---tosopinukirivisoma.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/danedijifubizuje.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/99080624101.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/b76l4tvh0shqb9dtqsf3g839mg/takufojevapazeke.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/8e887243adce444f306a10b6daf6f094/jatasedadimisakafulixev.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210621231032891.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/45623714928.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/415980f0beaa3464a55f212a71858eb0/64160926599.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608f987cd6c98---68046367057.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/833613f5509dfc66577381c21da6d0b0/zadapojewababejuzixigu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc1064557---wesek.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9471d21af43fcd3dd67b0a643a2548de/fewenot.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/2ce6e224220166060ff0fc6437102632/buzot.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c118f89c---38396293157.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/58152988711.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/wuxakolofuvot.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4338820cb6---luseluxugotazupolapiwokir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=day+camps+near+mePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 10296 bytes
SHA-256: f60f079674027a110c2424474f8556657216e63abe41889b0e6ae7e6c557b28d
font_02_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 16424 bytes
SHA-256: a146acda56d42a34b20d6d9b2a8c860abc07a9f6900270e038f0dc4c24a0f35d

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