Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1f4ae675efa145…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 10:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c7ce2818d00148ba98e8dfff9c882c6 SHA-1: b8020a3cb945fe5560b4e6011c48d89ade9b68cb SHA-256: 6d1f4ae675efa14578500b71a9ca6a02a6fd497b84b58b545b3924cee2e2a19a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=mac+cosmetics+product+knowledge+manual
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ada1b87f---44422620848.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c71a2ae130848656d7da578404adbaa6/vaxewaka.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zoruzovero.pdf
    • http://a-kamen.com/userfiles/file/21550753484.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca21d94341---21321520096.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b61d91f79f---57202774785.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/m48reo08clau7hacok54vo7qf3/nulavofutafaz.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/pj9bgj6gqs7v5sol9c6i65d33v/xilurinopixazoxi.pdf
    • https://daaeportrett.no/upload/file/79640408879.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d48d0b566---63946725084.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c00c2a4c4---90883440854.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a4def9d8587cc21af238a9d594f70806/degixilokimozov.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160909e4e080e2---28610611954.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793b160a48b---metexidetemaf.pdf
    • http://hilltop1976.com/clients/24685/File/kevapifizo.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2f3b5ec4423p6rf6tchdd2va47/dixagajitolufaretufoxo.pdf
    • http://eperon-kochersberg.com/img_db/narofe.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/f09inurpp7rr93p79id35tl6oj/vodixelina.pdf
    • http://vimbark.sk/editor_uploads/files/71910027763.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/jfukur4scfc8rpsrfrchlqv9p8/pelovedibelipigevul.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/pmb1rut57j3t6ioe0gbg3ofnau/xudekaxumat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a0.bin
4c0242d954821711739378101ec0438f50cbfbcd21986100e57419d23dff2bd4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 17668 bytes
font_01_sfnt_off0001115c.bin
bdd8d9c552c23ade692774cb11439c43774b7100723a33c0b90000b2e3a60bc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 11128 bytes
font_02_sfnt_off00012b34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B34 16792 bytes