Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac641fd93f77012…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 14:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ca1bec1bbf42b928841d5bbfda4830c SHA-1: 42448a037feebe9a366f2712b2f486c3e0f3887f SHA-256: fac641fd93f77012a3d27e59b1f56665545053f1b2d0dbd3bc9719043f9d96cb
196 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 CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the numerous external links are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://huntic.ru/uplcv?utm_term=post+harvest+losses+in+nigeria+pdf PDF link annotation
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/55330405018.pdfIn PDF document text
    • http://marymo.ru/uploads/files/saxoriwatopikebitivovom.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/4013776858.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/48503103214.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8c706f03---9256242032.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/34354210055.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/nudumidaxam.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/70579920884.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/tikaja.pdfIn PDF document text
    • http://newo.ru/files/files/revunez.pdfIn PDF document text
    • http://napiarsaigh.com/images/48891105305.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/11918147858.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/wasoz.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/99287076601.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/58363289859.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/65297046823.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/70425724833.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/54600824189.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/kaxibefelupal.pdfIn PDF document text
    • https://maturana.cl/upload/file/pipavekojad.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134555127f1b---43918861562.pdfIn PDF document text
    • http://sentralperdana.com/file/mumekorux.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/miguruxinokugefu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2e825005---92189906960.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/47471050224.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137aba35a604---23349312755.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_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 10844 bytes
SHA-256: 4303fc326901eb20b9a9b666eb0b80c5272e29d7310a4bf13bfe38b40ee79aa3
font_01_sfnt_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 17924 bytes
SHA-256: b7f71c271308ecf04ae30904fb486db129fbf5b7198f773b78b5ed0f2e09fcba

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