Malicious PDF — malware analysis report

Static analysis result for SHA-256 52169a37e8191f8e…

MALICIOUS

PDF

73.5 KB Created: 2021-08-05 00:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d9dcfdd7b3090eb5aae638d13427083d SHA-1: 2d659608be0a8e8c2dc4c513ccede15a07ef6310 SHA-256: 52169a37e8191f8e320194d984159470e136fd684d406188d7a90ea04026ce59
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the overall structure and URL patterns are consistent with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8440

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.
  • 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
  • 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://nomylo.ru/uplcv?utm_term=2020+farmers+almanac+pdf+download+free PDF link annotation
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/66709fb21ddea5a1283e4cea6c219760/ziluzowomokuwadanow.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/52576878123.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/32638599890.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/eu2vuhr4skpsa1uprnfdai8svt/15380919770.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/59286563063.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0d18f0a5d1453149a2ad3bd287678768/vevotabat.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/45209572997.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/selebekebinobupixi.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/divomipe.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/ximozomawamixiv.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/gafutitozafixuj.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/kivonugifozanewamavelovar.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/kepulevifovulufimus.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/witisijelatusogaje.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b18ba74e7---86886415658.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d0ced5fe4ea97ebb8de3c691fd519ac3/gagunaduvo.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/sezudoravovuselugewin.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/tovirezuva.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/58579381809.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072ddb27530e---78472652284.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0cdcc3512---wefutubewivubuw.pdfIn PDF document text
    • https://kultmotor.hu/images/files/11088466615.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/72456904633.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/at085ru57tjnj9vpdv9dq2ro7d/vimibasanesagilosupulom.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c8db451860cb9091c211fdd025595fb6/64666752636.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 10820 bytes
SHA-256: 5fd17f065e16ec47bb31b942039740b38f2f1cf9a01f54c1100d041a96615b04