Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d25a6c20c2b6621…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 21:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb7ef5ba8333d5c571ad5d80c7be7978 SHA-1: 7a601e6b97aee6070b87ff3a2cbd1cc5e9f96eb5 SHA-256: 9d25a6c20c2b66214d0300fb672237c5f5478d2c288b83f9f4bf88b4e524c53f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS uploads. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirects, hence the inclusion of T1059.007. The primary attack vector is likely Spearphishing Attachment (T1566.001) due to the file type.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://giustofiori.it/file/32786425991.pdf In PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ec3b64b66556be41818a8646ed1a1c4c/20567655357.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/31f8b82c7886a280c72f58c160a89d9d/4943402125.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/41708390490.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e2316f20a73---1200510144.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/85463724735.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/25157681153.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/tatomibonusumisowi.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/ralifepoxakaba.pdfIn PDF document text
    • https://rcot.org/userfiles/file/35780590242.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/53704313177.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/pitasixulefus.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/0893241ddc1605dc339ad671c5ba14aa/12343553906.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7bb3cad6780d98c93630a5173f20ff42/32871582921.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4052ae13cf---pigemojiwavofa.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/55264724027.pdfIn PDF document text
    • http://snft.ro/media/file/jawawigenowi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1ccde4a0a---suxanawasat.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0a63eb9033e287ccf58e0b8956af7bec/82911026720.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16116b95391f9d---paguzibirisukubipoxesu.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/bufozod.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb48f9c18fe---22815901869.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160777b16c6745---dubolijebosazer.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2246c0075---18544915196.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a1854ac78---39006997604.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210729_230610.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160f1af99d45a8---zumexonin.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/kipokonuvimuwojifiviwuzaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=free+multiple+meaning+words+worksheets+5th+gradePDF link annotation
    • 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_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 18308 bytes
SHA-256: ddcf6b3627cbf0f09adb1fb271aa5292961273bc55040342f0c80fc28a1ac2f6
font_01_sfnt_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 11228 bytes
SHA-256: 8924f6b9b68575adca8c742e16890842b2b9320f39f67ad836e4ac8517644acb

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