Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff3396abe3cf363…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 01:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 519601ea3f33cb79aa44c2b31afc1621 SHA-1: 958fc9f40c3b9519ac5c2db4ab2210f4aa1e98b1 SHA-256: cff3396abe3cf363546e33d5b89af58b5a2e3ac68d139cd20d19bdc8b694cb4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40a71801eb---kugarutida.pdf In PDF document text
    • http://logtech.cz/foto/Image/file/saxiwo.pdfIn PDF document text
    • http://mosjob.ru/images/file/pareg.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ds6p53brlv9i10kv2h12d63jt4/lolilupedosa.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/94237310791.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d077c14d83---43440063954.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/23083232561.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/97613452991.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/34455274048.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210819001731.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/bagajolirazavefeboxapaje.pdfIn PDF document text
    • https://semut73.com/contents/files/nonifitab.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/dusifudap.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ea5fece30bd27fe623165e10cad79193/lopodawip.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/wamixe.pdfIn PDF document text
    • http://atomleasing.ru/media/File/68848485227.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/xawurafisopafaji.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/82d8dpnts0vpdnghe43bl0kh97/6509146355.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/c862f36098ec8e604ad196346ce57372/53112352695.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0960cbaf15---megadetazafizu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5fbcc45d8f3bccbd484a6e70d0211ac2/24964868780.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/juduv.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/64010527355.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16273802101707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sprouts+bacon+chestnutsPDF 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_off0000da59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 17584 bytes
SHA-256: 6c481c9792eb3896f6270e8fc6fa01cdc5c17de33360acaf52572fa4d304da22
font_02_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 10648 bytes
SHA-256: a7a062018399c3b0a722295361b68f46e4d383fdfab73e759efa33df7c62084b

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