Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55e47ad335aca9c…

MALICIOUS

PDF

246.0 KB Created: 2021-06-26 10:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a00b70d72216ee580c9365f558364d5e SHA-1: 3d606b008f1f8761bbd4ba10eed6f7abe934cc96 SHA-256: f55e47ad335aca9cee77a356aacf5938b680e5779790fb7d9d59a8ac97171089
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics indicate a likely attempt to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

Heuristics 5

  • 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.
  • 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://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/45503c99af5b3c58dc733944f27c8251/zofovuborofegapugafowuj.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cfc5d83cf---96807562593.pdf
    • https://aymfly.com/aym_image/files/tikipokoperixorajutemare.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b164921ae8b02731ca8ae65feb9fb38d/riduzovozununavefataju.pdf
    • https://taxforce.nl/userfiles/files/51939759012.pdf
    • https://juhaszautovill.hu/userfiles/file/jonitovawute.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730e77d56cf---dupobalujo.pdf
    • http://arohitourandtravels.com/userfiles/file/tuwafumali.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bfa0e01d1---62135857201.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9f4b490e---vetawaw.pdf
    • http://interel-rus.ru/test/sites/default/files/file/zisofe.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080fa4557e12---nabuju.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5c84f13b20ff3f600f5f41ec263a55fc/38336696146.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7e82ec86e17f4e53f691de0cce429d46/34712962088.pdf
    • http://ilkyoukais.com/Images/Media/files/16889345600.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/78808703831.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6edc47026ae55644cd887d769dbfb780/20961700583.pdf
    • http://medicare-darmstadt.de/bilder/UserImages/file/69650798853.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d037e2699a---dufifugovutol.pdf
    • https://moveo-sport.pl/userfiles/file/dofozinadumegilop.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16095fcf250651---32638805167.pdf
    • http://usaoxin.com/userfiles/2021-5/file/79173781935.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/suhoht9idq5dn7d93e1i85d725/54476296369.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/e5op2s874o28c65o39aauud41l/seropofuzuw.pdf
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/metagabivegabomusev.pdf
    • http://cga82.com/admin/File/83729677975.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=towns+in+fermanagh
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00036aff.bin
e005a850ce28b58f9bfda4d8b970f5928b039ee501a6b00b0fedd954c4cc6b89
pdf-font-stream PDF embedded font (sfnt) at offset 0x36AFF 10564 bytes
font_01_sfnt_off00038302.bin
3c78a0eea533dde74d9e28cd67863f39458b24f935194b09f4566d2d610ea6fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x38302 18004 bytes
font_02_sfnt_off0003b163.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x3B163 16792 bytes