Malicious PDF — malware analysis report

Static analysis result for SHA-256 f705626aa9a40f21…

MALICIOUS

PDF

90.5 KB Created: 2021-08-03 19:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ca930200829e552c7efdb05b6bed1c9d SHA-1: 03d0c38ea8ded866bdf11a578fbacfa1bda4b11f SHA-256: f705626aa9a40f210d2d38828cc2ba6c78f89fce7e9a6fe2766c40d1600fa5b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sunnysidehighschoolclassof59.com/clients/867562/File/letelamoxudegiro.pdf In PDF document text
    • https://ckmusicdesign.nl/userfiles/file/97758907526.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb1276c4ab---xugipokomufufikob.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6b18f096---60241316327.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/2ueioojlteki9294vlfs9u410r/99753890670.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/sekisejovuzimi.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/suganogotogamufuzuvuzanal.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090550069b7c---6422017303.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/ravevexegu.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/97628422998.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/goposovojejuzajam.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/biziwogulinexitiwasevizu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffe8f1f48e---92212793370.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/jomumetomajeruno.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae303ac76d3---bifag.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/96a54931c01949cdfcdb36b63cce0587/gofezosupixugolugo.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/13202066d88a6bcf483169cb57e1d82d/revugevenafojakojaf.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e81b9d178fc4e481e468f6baaa70abba/wetadavebutibej.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04b054604---17917937703.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/aj45givb4f7chph8asl5h9saka/76157566328.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c502b55b7cb---33501579003.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/jaseb.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f0c59d15---zemifaxijatinalidabadi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/5nsd84tmu4sj1egemf9t1l9f0i/wiziripemokekuzegasevibim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+across+peace+keepers+spyroPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 10588 bytes
SHA-256: bf6fcbc126e7b75e2f680136b81f1296feb7d2ae2fd69adcc4f17a21efc0f40b
font_01_sfnt_off00010906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12118 18372 bytes
SHA-256: 138c519877173e6ad738422b6db0fdcbbb923256e7d648e07356b70981d06605
font_03_sfnt_off000150a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A5 2556 bytes
SHA-256: 64b8f1909ff5f2565740c9a12ff529b2e47503214c7ffa2f6142c935b8e8e55c