Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab81aa2076deb97d…

MALICIOUS

PDF

77.4 KB Created: 2021-09-02 09:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ae1c700bafc6229cf92b6eb28729a23 SHA-1: dbfe4404ce0b3ed587ec70b7b71499d5d48fede1 SHA-256: ab81aa2076deb97d63864d4374efd1ebab18a3bde2019c322fcad42a823f3014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a38a14b33---806278681.pdf In PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/599698c756b037d5ab03ede613c46290/kumenunesonegupekozigam.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f23ad48c4---27809752728.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160717c872022e---95618418051.pdfIn PDF document text
    • https://baptistfriends.org/media/gavunixewuv.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/bozutilobakatumejevo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9f52c4638---46231895741.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/dopizorewatexap.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/72909472252.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/tilomegupiduseledagi.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/53433451870.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/xawogu.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/50208470487.pdfIn PDF document text
    • http://vladekoservis.ru/files/xatop.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d444062398---wolekusalufirozujuzas.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607594f27cfbe---vifen.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gunatuxef.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ea84358096---sisate.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///257036636.pdfIn PDF document text
    • http://amandamaitland.com/images/file/nagagafulobilirefobofu.pdfIn PDF document text
    • http://islandpointfl.com/userimages/86308372876.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/rawepujuvupisixidike.pdfIn PDF document text
    • https://premiersuli.hu/files/files/28167287378.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d9af9b1f4bc---lumupaf.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2f10b3b05---waveremegipinojofexufewus.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/05823d393f87748d6a2cad0f0a83c4d2/53120560098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=from+pdf+to+pdf+editablePDF 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_off0000c4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 10504 bytes
SHA-256: a7317f0cba46cff47fae7b763e57aa3095149ae0c0608ac85a679d523eb0a33f
font_02_sfnt_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 19652 bytes
SHA-256: bfaa32a14c34e95a272d433e9963097196b77555d83cd26926bb65807a3152b7