Malicious PDF — malware analysis report

Static analysis result for SHA-256 1561378ad4b21ae3…

MALICIOUS

PDF

87.5 KB Created: 2021-06-27 09:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fc2048365e70d9d8922e9e2e26e96f5f SHA-1: d2ae42b6cbcb99b886daf5635770719a03a77b85 SHA-256: 1561378ad4b21ae3913547355cb340cfa394165a23076ac3deee81ff49eab7b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=maurice+duverger+classification+of+political+parties PDF link annotation
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090584dde32b---69930842490.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acda51175e1---62193594682.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/vujuwogapefugani.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/905df799c3d371a6582004f0c5e6ecb2/xewewukeboxabagu.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/kadofaxejadetifini.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/99507393410.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d5187eb2---nufadilemivabonujavenumo.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/52561658269.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/95683098677.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/40938831196.pdfIn PDF document text
    • https://hirurgija.me//files/vorunikel.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078da08b769d---sidupixetogowa.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfb12e6dcf---29951328702.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c010ff5d431---9373511564.pdfIn PDF document text
    • https://aspirans.com/files/file/22350955174.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/sofejupulediduvuzuk.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/dumoxulowigagop.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3973e94e9383a7dc76534d529660ee72/ziwuvuzeponorewedixu.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/56322076008.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/72453595631.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/jomizaretegudufaj.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4094f8010535ab4d1aa7dbe510f9b37/46614311838.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/fiborawewutek.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zuwitakoniliwozafebir.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160751f14e7013---70283771212.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_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 16544 bytes
SHA-256: 9e7f1a0158293668b6026c2916bfed9eb6f7b5a535cf8443907bb613ddff94b0
font_01_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D8 10952 bytes
SHA-256: a67c1c61f1051acfbc6c16ea13426fb4e5e6becbcb7b340ca98c257264a7f671