Malicious PDF — malware analysis report

Static analysis result for SHA-256 a666009dde8cc7f0…

MALICIOUS

PDF

73.4 KB Created: 2021-08-28 00:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 888ad9c8b6bcc9a09d524971064f50f9 SHA-1: cdec916db14fc7363e45d3c17d64cd769d569692 SHA-256: a666009dde8cc7f069e14f7f3a9955a8acb0793639d82ad3bd69fe37ad36224f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://drafthe.ru/uplcv?utm_term=rogue+river+siskiyou+national+forest+hiking PDF link annotation
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/5876ae50ab375146262b27e69bf7675d/71381882511.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/susipa.pdfIn PDF document text
    • http://altinay-law.com/images/file/15257981978.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/50183854974.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37198cb54---bagaderefuwi.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/62556423473.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/deff31b9932fefee22c35b07558e8363/63006522918.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070a2689b723---sokuzilogewul.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/50590570240.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/fezeb.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5074af5e625f22c97be99f84cf744d98/34311883307.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/lubamofenumopujij.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/81019122972.pdfIn PDF document text
    • http://jmyhship.com//uploadfile/files/bozobipeseleko.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/25966346418.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/92094555389.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/7097525551.pdfIn PDF document text
    • http://bdn10.cz/files/file/vebufupitobavirefufagu.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210720105424.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d9cd1db3a---32530752345.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_off0000bad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD0 16640 bytes
SHA-256: 7755cb0523dffcd48a8c8d1110d7ae6c0bbab88733f86bed059e6b857db5af3a
font_01_sfnt_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 10908 bytes
SHA-256: 6f04334bc5b2a2ffdda2a993f8a842701f70e836f9cd4244284e283df0a6b2b1