Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5ea12fa3fa75f5…

MALICIOUS

PDF

76.9 KB Created: 2021-06-10 18:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bae392fadd1c873133e159dbe509e28e SHA-1: 551505119ec5886998b5263b5ae7700d5c692411 SHA-256: 6d5ea12fa3fa75f5621a3ab718b0b24d64ade731cfaa350b1725e457da810505
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to compromised WordPress upload storage, suggesting it is part of a link farm designed to distribute malicious files. The document body, though heavily obfuscated, contains text related to 'free online collage maker', likely a lure to entice users to download the embedded malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=free+online+collage+maker+12+photos PDF link annotation
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff62f66b1f---lopimutikir.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087451e8c2d5---gogamif.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8cb0e1d1cf031db519a6c3a24e82d5c4/78777256423.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a55a70b7---bogasupimakigovimixadokap.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/212bf4483e49f3e55e98fd57a87b6878/saboxezil.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae4907eee---nogevosirusode.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783c0b88926---96413838525.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/wubobegapatezawugeba.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/650e33ee03af5193c8236743aafa077b/75223947279.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/webapixasabidilakef.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d04fa57bfa6d7fb65627630a303f25c1/93597589094.pdfIn PDF document text
    • https://actorconseil.com/files/file/56163483905.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/amun23ekha0ps688dv7ridl48o/runapokovofugexo.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/fbe5e881fb2089ae5d9eba22de09089d/zoniminizojojig.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/t9cg8mnf9a7rvs3k5d5cgt4ocl/8394161274.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb9ce6d94d---nuzutanipikebejidewopato.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/eec1dd148595a18f3b601652923af834/tarurikidazuzorumi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 5552 bytes
SHA-256: b98e85aab042f045f632d38a7f5b6b04384270eea4620755c7cc1ea92a345c06
font_01_sfnt_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 10708 bytes
SHA-256: 053daf8f48ee948f190d4a94de75dd8087d291e3e83fb0b786844a711fceea50

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