Malicious PDF — malware analysis report

Static analysis result for SHA-256 312ecd3056f124a1…

MALICIOUS

PDF

84.5 KB Created: 2021-08-26 05:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8524302bee34c69983422360497ef12f SHA-1: 628d3b954a60c05ae7fbf7db93966724fd5bb63f SHA-256: 312ecd3056f124a196c40544d9bc1ad67c0acaedf8bac90d171fc8bbe23ce4a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is intended to deceive users into downloading a payload. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50e57f31f7---61540223202.pdf In PDF document text
    • https://atcotourismtravel.com/userfiles/file/deragirikig.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d4ce1abc21eccae52818f72cd7c397ff/jivabe.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/26bd1edd3b07f8b6526a2d9ad854fdfb/fabugevuvirobadagifoxejul.pdfIn PDF document text
    • http://delve-cr.com/uploads/durovutimibawurodub.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/guxakisaxegorolabep.pdfIn PDF document text
    • http://kahasat.cz/data/file/96224521050.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0790b53a5bf2a91594a7bd56042a9cd4/runurolodojokefi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a45d2ca91f94b499cfa59bf2e725d7ff/95844586810.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/kekotuninexiketotorog.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/wukiduvosed.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/6267851821.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/93318148432.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/bec09eb81a5f668f1a6f9b5def056220/totodutil.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0801da9b9---binojarepodakokaw.pdfIn PDF document text
    • http://coffee33.ru/archive/file/pegajep.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/23583479635.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889fdddb99a---95755721909.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d78fed09ab---zukipatakalenasevovur.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/71b3f45a78c903264508fe718d40adc5/97095647731.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/buxidixodutop.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1fd01af06---26193285276.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/suwilurimumopi.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/wokazulij.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/3702216905.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/996408833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=meaning+of+premises+in+accountingPDF 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_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 18876 bytes
SHA-256: c15e3a32d7af03a0798d9b3f5233cd5df606745285adf67440bcc3e519345993
font_01_sfnt_off00010fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 10868 bytes
SHA-256: 73f351305b28053f1eec97c947169f42e0fbbd1dc7d3676a3504c5f7cd58760d
font_02_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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