Malicious PDF — malware analysis report

Static analysis result for SHA-256 77870bb47e1e6adb…

MALICIOUS

PDF

90.2 KB Created: 2021-09-17 06:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9b81ff3f9439a77e1726af5aff379c31 SHA-1: ac5251de3b2c987f223655c5b06ca10c94c94bca SHA-256: 77870bb47e1e6adbb7d0220392ade928f329ac5a291daeeed8b134b06a678963
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. No scripts were extracted, but the presence of external links strongly indicates an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://inwebjor.ru/uplcv?utm_term=dr+hank+mccoy PDF link annotation
    • https://dascalita.ro/app/webroot/files/userfiles/files/gelizozukatizavebikikeja.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/xozikutiwaxafo.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210905_190835.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358a0072689---49603477267.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef6edaa055---12666923927.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/52604188998.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/77651085466.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/viwowafoni.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12741186196.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/28462066622.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/namevupetol.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/feviretifugirarofeju.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219112145405180.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/fiwigavewogivigurezapu.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/13976268350.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/66497822335.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109161056524485.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb4cae41f---jakor.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/pesituwavija.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/vatazakasawunem.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/33769426585.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/26794816054.pdfIn PDF document text
    • http://imaginove.eu/data/Files/30027624957.pdfIn PDF document text
    • https://naves.cz/res/file/pozosonofarus.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_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001150c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150C 10168 bytes
SHA-256: cb5c938253a9eda09ec8264b1c7bd66b99472f2331cbc9a7d627c19071694fdd
font_02_sfnt_off00012b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8E 18640 bytes
SHA-256: c7713258da752f30fa89f901605d673d5c200b92ecef8b9bc2a295f449af42be

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