Malicious PDF — malware analysis report

Static analysis result for SHA-256 818711037dd1702a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-11 21:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0d13466933d197ef05f6f6f8a8c8457 SHA-1: 3c606af698ee120f68e2a5d93b3907622288539d SHA-256: 818711037dd1702aaf3d9abf18f46a436186b81ed559d6e5cda5be1743dd5628
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. 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. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://minerva-collection.net/files/files/79059535166.pdf In PDF document text
    • http://zjbfjt.com/upload/files/16318733998.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8f820279f1ac5bc3d95dd41208c51650/7399366885.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/rumofabufo.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/sawudizopasavuwinurobomo.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/fetif.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/suvojedinesijidug.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/bomaxakesapukixerar.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/99159394350.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/94d38cd1fb0a31d8cfb050d4fea5ca09/bapot.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/11484344075.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea890762c---komasemezubanaxivixomes.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090504215027.pdfIn PDF document text
    • http://platcometals.com/images/file/66713739680.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/gakuzi.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/82417364725.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/27230632703.pdfIn PDF document text
    • http://artediapharma.com/upload/files/39787861932.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/regemozalidalisejeruse.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/82364134728.pdfIn PDF document text
    • http://blgjad.com/upload/files/kujujamamijifoga.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/botoxofovafowibo.pdfIn PDF document text
    • http://word.mn/uploads/assets/54935904145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tomar+fotos+automaticamente+androidPDF 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_off0000b2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD6 16116 bytes
SHA-256: 7e7aab3eb9a41ae3f9ece8229fc65f51695a604bf97ddc9f85d544022ea2fd09
font_02_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 10656 bytes
SHA-256: cef86f3bb555d3e663655341baec1f5548220882a42782e3db8ba889f9232239

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