Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7eeafffc8846a59…

MALICIOUS

PDF

87.3 KB Created: 2021-08-07 21:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6be3e75f8f44ad8074748ad20a3f9874 SHA-1: 22fcba12efb32665146fd7fbed925cc4ef2ed728 SHA-256: f7eeafffc8846a59f9e033b1d8399d4a9af5d6e7d160ab6359497a899430c7b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The presence of these links suggests an attempt to lure users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/uplcv?utm_term=how+to+set+an+onn+alarm+clock PDF link annotation
    • http://limuzine.md/userfiles/file/62913645755.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/33476711804.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/kizudutomaderaxo.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/rilote.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/nilopesu.pdfIn PDF document text
    • http://mvpvo.ru/userfiles/file/39911908909.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/9702831120.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083e37f2fea1---vapukisasobonilakukipeme.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b55d4fdf---65398478465.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/26716340710.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/foxafigasejadetod.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/vamelogufixu.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd4a00ab4---fibirabuxuwutorija.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/zukuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5442c82cc9---92733837839.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/torofop.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/ximib.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/magop.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707475e14ec---diragat.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/dejusizubodoruvi.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/zojosujesibadamuxe.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ea36b97fb---sifudotetofalolixoro.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/21380467744.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e62b742f5---70419839542.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52a54285da---97543651491.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_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 17432 bytes
SHA-256: 56bb3a4a9d583d3cba42e608e3fa4d2e6aa7b6b88f7ec6b038c7e962c44f9e65
font_01_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13760 10468 bytes
SHA-256: 20ac600515c35f6f3cab7e6f3b4b2e26e26c3d1e326d2dead04ba3a5a8e99653

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