Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85cd64c6662f861…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 15:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25c1ab9fac102f5184a8b2f77305d517 SHA-1: 5f7b1d74ceffd9541ff970d6257eafbd03aeea2c SHA-256: f85cd64c6662f8619cdcfcb7a03bc7c682dfdcc3a04f2cf1831765b4e568a13f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The primary attack pattern involves luring users through a malicious attachment to access these external, untrusted resources.

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 https://ketchas.ru/uplcv?utm_term=the+interpretation+of+financial+statements+benjamin+graham+pdf PDF link annotation
    • http://protok.pro/upload/files/viridijezowogabalep.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210707_D66C1399F55D19FB.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883c05073a4---rurikerivixamoletuxi.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/dozel.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9354a4b10---62926687824.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/1593082902.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/tikaguduguruvefudo.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/40630122213.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1865a1b67---bofuwulezafebizite.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/k057levouve0paqm8epuevlse3/36926782014.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/rarabazejeledenanusi.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/6aec3a29ad12080420819922493fb353/bopupedobikuxofugujawowan.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/porivinuwetiwaropep.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/mjqfkd6e1ui9aq8hl87fc49ger/rufoperovafo.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/gebimuso.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/77a1f48eae0b54bde69a2b3ccdfeab66/24414279884.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/16312086691.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e01db5d848c---xafugela.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/23093038754.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160714752d8ab9---17949563879.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/91535768503.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/werubepubipixikebebuwuni.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_off0000dcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 16804 bytes
SHA-256: e4e115675564f228850005ac9c6b1f3d401a7a47fc1a00f167641923ed533b1e
font_01_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 11300 bytes
SHA-256: 682542576d9fb53c264f848044d9967113d9a09853cff660a646beedc2a414e0
font_02_sfnt_off00012217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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