Malicious PDF — malware analysis report

Static analysis result for SHA-256 808f766691dc769e…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 01:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0006806922eb41cfb264a681e3258476 SHA-1: 08f195bc48f4a27abf6edc145d644c6a2f91fd50 SHA-256: 808f766691dc769ec01367a7fdda648a23b8901eb660aacc96a68396a78cdeac
156 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 sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://crysiq.ru/uplcv?utm_term=file+manager+computer+program PDF link annotation
    • https://perfecthospital.org/FCKeditor/file/65915184528.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///tuwulita.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47d3f1e45---6836908648.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/19e74abb70bb8c05f439bc3abd15e1f7/dilazirunejegaradaruf.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/nikuwawewegedemutatobetab.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///vopozukupebibotu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2adbaf2877b79b7dfce02ce6cbe94831/bugawekowuzogepobu.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/puguluboditasodaxit.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/bisawomagudidu.pdfIn PDF document text
    • http://metapolar.hu/tmp/riwadunixetijinapa.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/88792427165.pdfIn PDF document text
    • http://zgic.ru/!upload/files/77571142577.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/nusimirirawapokaxeni.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/kotadiwu.pdfIn PDF document text
    • http://kustari.net/userfiles/file/1173094253.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/tatmj4vr8td19l8aodik2at3rg/52023893814.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/8062676591.pdfIn PDF document text
    • https://andrejc.si/files/file/faluru.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/sekal.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/dozilizewafinumotuw.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/temididina.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1630943278648342830.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210914_090725.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/kevifewep.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_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 15476 bytes
SHA-256: 1a6f02991bf1713ec1f49fd2ffa6c53a13b14e5c7011f97e9e8fa1b57425ecb1
font_01_sfnt_off0000fd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 10628 bytes
SHA-256: 083fbda816f466f5783593f85b6bfaaebb37a1987e409f33ae03f614718bf5c7

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