Malicious PDF — malware analysis report

Static analysis result for SHA-256 826745987ea7fe64…

MALICIOUS

PDF

88.5 KB Created: 2021-07-13 18:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bee24fa5c9bcf6e53e495b76baa23310 SHA-1: 1ce169be49ef27a34530e2350339e23ce705e5e7 SHA-256: 826745987ea7fe64b25f19c51726c1c82e0d72ee3052dd9c534de255ff19821b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the heuristics suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://holocaustresearch.pl/nowy/photo/file/kuwinomasamul.pdf
    • http://internationalnetworksolutions.net/files/
    • https://doublehaircenter.com/upload/ckfinder/files/22819503190.pdf
    • http://eko-inwest.eu/upload/file/25158606757.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a97746dc4---4692783227.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/nujolimesukun.pdf
    • http://sunarfactory.com/userfiles/files/10357305781.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e690378425d---toluvawerevanikaw.pdf
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30337539645.pdf
    • http://sunarfactory.com/userfiles/files/ruzela.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5493f6e1d6---69126983435.pdf
    • http://www.bandungmesin.com/file/95105642246.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/30165078500.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d37fd4fa64dbdd3ed07d01eba6327eba/wufekebutigepuvuwuzozeruj.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6d4195af70e3e97e146c8e0268619d98/45288118359.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/715f63bba1a074e7b9399c0d76922dfe/49780278123.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/225b4e880bb73d49c256fecfc0183a8c/fuvifalarax.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36b77c003---30727186919.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/fdaf3e8380292ce8663b154c99b0ef6a/gemalida.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607936617ce0d---53292378962.pdf
    • http://airconbank.com/upload/fckeditor/file/lepaxinisiravutazowev.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bnd2hjd75gqoh1jsivu0gg84k0/13980148116.pdf
    • https://cebrigantina.com/025-CEB/images-editor/file/bobisokofato.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdba90b1218---59874746306.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+you+handle+pressure+answer
    • 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_off0000f4aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 16792 bytes
font_01_sfnt_off00010cc1.bin
1336a19388b5785b0885b773056cf905a6ba40e42078b202514ce92236d52d19
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 10592 bytes
font_02_sfnt_off000124e8.bin
10ba3dcdd2349bdcec4526910f9c4a530e2173a0e8c47fbf7ee04440689ee21b
pdf-font-stream PDF embedded font (sfnt) at offset 0x124E8 17624 bytes