Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f01c2439637316…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 15:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc8e1ede3dbd16ba1233951e47d570bf SHA-1: 5f2a641f49dacc19dbc1ad2d050e463518274e71 SHA-256: c6f01c24396373160fdda689363df060689592b1247cb5fe805e2f21b943c6aa
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These links appear to be part of a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ufq5ko9pnh28vr5uhboua03ip2/rosojiresitatiduwavuj.pdf In PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/lugujojimepejituberes.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/niguwudojezexa.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/59320146675.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/65e15da9a85e47e91c2c0ef17818c7da/fakowowudegexepusopax.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607208c9f254c---19082255050.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/jofaximivisinusijopo.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/68399105503.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/15530203626.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/talagugekap.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/fesuwo.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/2390a202c5d000b0d7825a4b63881fe4/kezuk.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/xulugimebaromawigeborun.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/wowafiburow.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/kunun.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/927e6dc0a2ec701c328f131837c66ad4/fiperodemivijofofada.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/gelugimujeteroluxek.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8c5b2d682---wirikowo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47cd0d4d73---37261513024.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0040b4095581361aad23f05d46259c9d/ditolamamubebituvokoj.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/tvu8k6v5loo4jnckhe02tsdqu4/vufewidaxone.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nbv7vm9hpkst0oka5j5d7i9866/guwabol.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/fefigekisapazasog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=resource+loading+in+project+management+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_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 16712 bytes
SHA-256: 2bb63b7b5dea46ba466110ca7376ec706fe0989a528b14e0c6e99de3d2e3a1a0
font_01_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 11240 bytes
SHA-256: 9030936c898ec8ff19c5d7a77767b089b5718e19695a63c66b5058970aacfe95

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