Malicious PDF — malware analysis report

Static analysis result for SHA-256 6857069a21593387…

MALICIOUS

PDF

86.6 KB Created: 2021-07-14 05:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cabd705b9a7b322d50e32ed238aeb25 SHA-1: a08c4bb36f4fca1e1c36e5db7f5f598a30ea6b15 SHA-256: 6857069a21593387d4d4b6cda6c111f2a15202e12055b8a176962b0f8c73baea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://tulsamemorialclassof71.com/clients/84987/File/sipupovelorenox.pdf
    • http://www.blueoak.fr/image/file/joxulexigazapet.pdf
    • http://crosswaysrecruitment.com/userfiles/file/xilavaxomavatineke.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/76099753158.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/qibhmpuctbpdt8ui8s733nhup2/kifuvulakenasuxosojepuwu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afca42ef070---49465361208.pdf
    • http://humanitool.ru/userfiles/file/25823286124.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d01d8168ff---sisasaletitep.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/o40eb2batnr1c0vjhte9oackn1/700197254.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/g8jbt8ic7kf640i8ais7erde0b/tijitinuwikiv.pdf
    • http://bajcsidavidfoto.com/_user/file/99396080010.pdf
    • https://camping-du-lac-dijon.com/fichiers/lotexivakutikexogoviboko.pdf
    • https://harom.ro/files/file/85294205350.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160d42026e8a31---lelukipelibebidisez.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a49ba5d0bd2---fupurabiwirakibunenebebov.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/k16nudgpcec5unqmqqc91d4g76/99169942629.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210710123702.pdf
    • http://accu-chek-event.com/ckupload/files/60849638206.pdf
    • http://lyzebrno.cz/userfiles/file/nekilasanokar.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/60332732997.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074b50a077dc---tagileferegel.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e726535e5---89886771124.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=secret+of+the+ages+robert+collier+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_off0000eb9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 16792 bytes
font_01_sfnt_off000103af.bin
7f8ead53e72e1e3069ab7ba518b408d08bd0147944f10b4987b841850494a4fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 18000 bytes
font_02_sfnt_off0001326a.bin
f29c966d2c6c53e54961845030aaa9560c7d8c46f24682c87494c8c018d60acd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1326A 11012 bytes