Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dff78f106ffaf03…

MALICIOUS

PDF

99.7 KB Created: 2021-09-07 21:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b467d2f42acfaa478c1ed941e9024384 SHA-1: 9fa9c31945cb752726ccf624272a9ff3d28b4f50 SHA-256: 0dff78f106ffaf03a5bdeb492c7668b382f4ca2f53409ecde836f18621d72345
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to distribute further malicious payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7e9ed8b2---zabizumavasosogijusadut.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de9cdc6b35b---filejegutebawulikepi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/tu3pp6ar8e6bejpqlbki40d62p/guweme.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd555daeddbac7e181031b091175a603/72859416670.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3549415ba---90841641863.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210726_DFEAA4F4D126384F.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bed282c7a65---pawuwa.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3aocld1pbancclmbqojv42njjl/18730758187.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/kegofobekir.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/suluraninufozegixanebo.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/49012223077.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/64778174883.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8746581c56---tafixiruwavi.pdfIn PDF document text
    • http://land89.com/ckupload/files/didevolevaxonelaweb.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/90031400266.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/tulolenobabufo.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/45428514f7207198001c26c8efd6206c/20692640523.pdfIn PDF document text
    • http://moristas.com/userfiles/files/42048300735.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/6050c227378a6cc276a93c660c890c71/22852072038.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941d1612a0f---6194057926.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/sowefegu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad42742b804---36206250389.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/xufivanagatizob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=3+regiones+naturales+del+peru+pdfPDF 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_off00011ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C3 20364 bytes
SHA-256: 54a2209b072a3f56c24af8447614227fe5cd6596e16434281c37f21dfc33453c
font_02_sfnt_off00016737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16737 10848 bytes
SHA-256: a1eda2a7630fc34cbe16797d8c105892fbdc3e00baac66114b2fc30711ca6ab7

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