Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a119b7c0734cf6b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 12:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05bbfed6821f446c61fc6ba77701aa4d SHA-1: 7d25d6318e927474b8d8e7b75240c2a8d2a67a8c SHA-256: 2a119b7c0734cf6bae9509012bbbb0a93088b2d18830e321714608e63e7683ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of numerous external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://live-lessons.net/lcj/web/uploads/assets/file/27682656336.pdf In PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085677c53603---28426692800.pdfIn PDF document text
    • http://parfumland.sk/upl/55884627173.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d00d84453---xexutisujalozevodi.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/86309963412.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ea5a6df48---22036864503.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/netivefuvifuro.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/9423644649.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/63766241686.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/suguxajiv.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/kuxezajujuxagebaw.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/81223061188.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/jizedomedupazazididaxe.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a073c743---13986123130.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed566a04b---zabugomomoraboxu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/256tlr9ricq2dvss7tgm8bpfe4/20487987446.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/67721780126.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/mizizitovom.pdfIn PDF document text
    • http://cy2hand.com/userfiles/lekesoxe.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/57070668932.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5b7f5b3cc---63786940443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=time+value+of+money+worksheet+pdfPDF 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_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 16988 bytes
SHA-256: 0f75ef0b7b68ded04a0221412c6f182f4b32edcfa2fcc2303ec189695c9de8d6
font_01_sfnt_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 11184 bytes
SHA-256: 5bd561280f4c8bf024a1a9c3c653e75c85fb3d086a09d89cbb2b7cafb730d48a
font_02_sfnt_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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