Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e1929d4951683e…

MALICIOUS

PDF

79.5 KB Created: 2021-08-16 00:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 289c284e46fee0824262b2552760c591 SHA-1: d019d8298469bd41dad2a108c0b3880f5fbef6f8 SHA-256: 17e1929d4951683e724d9b213a1005d5981e6b69ff6c48e00d3c21434c4435e4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The `utm_term` parameter in one URL indicates a lure related to employee shift schedules.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://agnieszkapawlik.com/userfiles/file/8604118304.pdf In PDF document text
    • https://aljuboori.com/userfiles/files/xiwefexaroru.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210612_205434.pdfIn PDF document text
    • http://sns.hu/_user/file/88076234596.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/getawujamuso.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/29014013432.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/ruxavujomafu.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/37785778205.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/wejexuvekudobako.pdfIn PDF document text
    • http://tipiland.net/upload/file/86827423740.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/31429974824.pdfIn PDF document text
    • http://modern-pro.ru/files/file/sudexag.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5af0135a51470b9780776183d2140a3e/85992013633.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/ruxugakofamemo.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1758267326104abc290d3f.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/xoxatupufejisitig.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/39886112646.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c2552b44759---78984571415.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/44343860590.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/nmqo2g0ko65hgttrrmu87josbr/bomuvodunifafasude.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/78770017076.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/93037866960d46b0a40de3.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=free+weekly+employee+shift+schedule+templatePDF 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_off0000d4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 11148 bytes
SHA-256: 74d7832089b22f645ba92b5d3bfb5e51154eef33794681b56e5b67903284926f
font_02_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 15984 bytes
SHA-256: f1129935ed159ce7b2967b9390b6b841d95d9ce1175d09190f3ec6a6b17292f5