Malicious PDF — malware analysis report

Static analysis result for SHA-256 a171ef2d1988e4c3…

MALICIOUS

PDF

96.5 KB Created: 2021-09-06 18:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c561e25b4a5df05a90715d9f780882a SHA-1: c8c29bafa60c91c217651c1065eddd08adc906a2 SHA-256: a171ef2d1988e4c3906626793a635de888c764ea3b4a802befde4bb0e564b86e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate an attempt to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://irlanc.ru/uplcv?utm_term=free+pdf+splitter+download PDF link annotation
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/u8m5tmso9bl1s5e2b0uohkth7p/gobovitibujotuzogalunu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0m9e81vo8n4l8ksmbkroqq2dl7/rixur.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088af9f223b6---rudimulijexegotiginexoga.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/39826507243.pdfIn PDF document text
    • http://secretinvitation.net/images/files/81469648567.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/wobeforilusexilefevezora.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/wesemiwapitefuk.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/fimabugeweja.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/83514929564.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/nogiresepedajewajitebejux.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/tomunobulipexigopode.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/79040113423.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/kadewagaba.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/96143104228.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/95324405403.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/47364645368.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/sqs9oapggcd0hj5vbo95qsp9u2/rugovad.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061804432373499.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607884d250106---59102854758.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/04b0fcabded7fa88f9546e6ed190403c/kilozegojol.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/gelupanudilata.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871e73d1a16---gifupoj.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/28636466380.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 16224 bytes
SHA-256: 64f0b6da39172dd4ee9c660e9e76f1d0ebbe60724ed3c05c35423f428b189fc8
font_02_sfnt_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 10556 bytes
SHA-256: 5071aae5c3a642a8eec1ec5f896e7dc3ee2111da96c8c40262628bf288deb814
font_03_sfnt_off00012b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 24916 bytes
SHA-256: c6abbd017e7058ad99d16cd1189b478e535d9bf30ca345a30e91b9f00f599d3f
font_04_sfnt_off00016ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD3 1804 bytes
SHA-256: 3e0df04775994f06af00dd43b182878e5699af55e11d9568351e5f77a1858c75

Open this report in the interactive analyzer, or submit your own file for analysis.