Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6eca0a767902e88…

MALICIOUS

PDF

89.7 KB Created: 2021-08-09 16:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 523cd7eb4f557c10064cbd8a1372b17c SHA-1: 76ab65eb9481e77cf306c28b20666a273db1d047 SHA-256: f6eca0a767902e880045397fe99c2b9e851aa09be85d1a83732032bc8eb49713
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a farm of links, many pointing to compromised WordPress uploads or disposable hosting, designed to redirect users to potentially malicious sites. The primary attack pattern involves luring users through these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://pixomot.ru/uplcv?utm_term=what+does+an+elevated+amylase+level+indicate PDF link annotation
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072b1e69dfa1---73548799607.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/77kbiufu6v0dl6fnm2gvqo419d/9954579649.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/tiwemutaderafupud.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/23285018461.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/4ae252d7e2dfcb54d83759ed7a481a34/52044367765.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/84109276931.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/limedasinifetirozosuj.pdfIn PDF document text
    • http://ge-mak.com/files/3222920299.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/turelusagewuvexazewub.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e132f9bff67---konodutije.pdfIn PDF document text
    • https://discoverthesky.it/file/bibidanapoxopiriz.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ft8qagq0o2f7n5cmanvek6ukrc/84408512526.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/055df1bb915f2804cd82233c439b3b21/monulokowebigu.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/vodozewobititatolekewep.pdfIn PDF document text
    • http://3sdent.com/upload/files/gawipitikuvotewimele.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a459c69eb7---79896362833.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d26b8944e---57511337549.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/42102249556.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160780f6b59d9e---nevotivojudorapi.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/bavorebamopukeposabolor.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef402b62d---venalebozizonunanisat.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/davulupogodifekoxidekog.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f25660678de---73386276310.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/904312025541fbbc145e2f9183bc7874/widowef.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078fd6459a77---tojeliko.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/38484131356.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8e23de9a7504875838d1ea0f27e45035/10054163727.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_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 16776 bytes
SHA-256: cdbc4838bb9315b73121382588f8ec56a37be3ef10a08012eac4bbd5f3dc63cd
font_01_sfnt_off000126ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EC 10708 bytes
SHA-256: 545a465644b0c1f159b924719de58bdfafd5256bbfc8428f2f3e1eaadba5cd10
font_02_sfnt_off00013f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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