Malicious PDF — malware analysis report

Static analysis result for SHA-256 c318f62c7249a1d2…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 22:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9e9e12d8047f2ba24244a3fc6c68c69 SHA-1: 28d8141532a544921c4141269c4982659761faa5 SHA-256: c318f62c7249a1d2fcc164238fc5321e181fe6878fe1ddeeddb9541fad0467f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=comic+strip+blank+pdf PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e5164cb6205---kivipobalaguvumavasokeba.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/majinopelotifefeboda.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/voromenalenuni.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/dinizizawelunotuxiser.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609727c8d94b0---pamedulunaziv.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/43710627603.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/pajebaboxafizuvodak.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/l3i37dp6ujkvu1otr5h9f3h39d/dafugujex.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/6d81326dd62a901cfa3cc74a83d04dd0/gunowelabifiregi.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/31006420991.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/97234167777.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/12620023933.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a132cb2e0bb---43675200229.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/sukedurubajipegululiwa.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608468ed6ad25---rezivisuro.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/99412498399.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/dapabufe.pdfIn PDF document text
    • https://emmaushuis.org/pages/favulefodibalum.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba776b9de5c---wasazof.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/19506308996.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/dapon.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/nebife.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/gelinixim.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089595c51189---talugitiboxetukavuneges.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/57839783083.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/54369536143.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_off0000d4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D2 10912 bytes
SHA-256: a80b232c3f6f0d112f5f5dbc90bd2e0dc53fed04d01bcd341d9ced8302911b13
font_01_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 16388 bytes
SHA-256: 8a57e5160fd48902c1a11c536853bba15ddbf950c3ad0dd632f2ab72a9634120
font_02_sfnt_off00011845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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