Malicious PDF — malware analysis report

Static analysis result for SHA-256 a645f8415a58f3f9…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 20:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4fee2e979e249af11a3b764963f562f SHA-1: bd25c01bc0fc8885e8545e945428a9c9856eeb53 SHA-256: a645f8415a58f3f987eaa978d0b9810c7165a73f7e6bcde7b0315badd181622c
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide a clickable action. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a downloader or redirector for further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://garglob.ru/uplcv?utm_term=m4+sport+hd+live+stream PDF link annotation
    • http://jjc-dev.com/userfiles/file/zugutatetejakatoxo.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/piwimaviwubikoligudokemax.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/71140549665.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6c764ffd---vugumugomamizinezig.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/wuremerovolide.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/tajugizixetaxez.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/73741586926.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/19742827373.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/xutafuxozerifufufitupuf.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tajenarolevuj.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614098f3bb46e---73293179474.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/25866169827.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/fasanib.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/wizutokavarumelaveb.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/53556629289.pdfIn PDF document text
    • http://flirdining.com/uploads/files/xixub.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613604bfe12b1---80742337208.pdfIn PDF document text
    • https://hgb.se/filer/file/13242318949.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/77291226632.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/gaxulejikozifomusazedepe.pdfIn PDF document text
    • https://blokhol.com/upload/files/vufiki.pdfIn PDF document text
    • https://yifff.se/userfiles/file/38125835830.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/25244403752.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_off0000b071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB071 14476 bytes
SHA-256: f74f7e4780ee56083df68d1b8d53a74d9325272083887bcbd95b7bd9c8fb5013
font_01_sfnt_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 10688 bytes
SHA-256: 0eca22c28ed0ad49fa99d0cd3d10f8665a64a5c5b4fbe2af4652eec31f99f3c6
font_02_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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