Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5ea93c8725d0ae…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 21:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9d94425d93f599f0fa06d1ed8c22ee95 SHA-1: 140dc8101c406b179482a9c785be53bbf32cfd56 SHA-256: 1f5ea93c8725d0aea0db65ff015364c773d2c2f07a1df6a4769bbff0cda0b392
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of these links, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, strongly indicates an attempt to direct users to potentially harmful external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://comfort8889.com/upload/files/ridukavusutozuwafi.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1879a36f27---77281503993.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835fad69a97---zekabubemevig.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/lpoon9ua764geo4jddte7s9a77/2108625453.pdfIn PDF document text
    • https://noventa.cz/media/files/file/piwokit.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f9dc27dae---rikoletagopusilora.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202108211819485426.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/34e3141e953f4d82aa6cc4ff76bb3430/luromeropaxalevubavopaj.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/rvp7v6mnt95tc101rgsh4n34l6/lupisoluxuzenugu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/4cee24af2ca117b08ac781691e785739/98628804091.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/dusuvomafufezametuwawufa.pdfIn PDF document text
    • https://advik.net/userfiles/file/tikesiterijidoveguv.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/31508edb5250e0abc58571eb06aa919e/51601757635.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608820ed1b57a---41997555734.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081863e26f86---zibunibowofegolotaz.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/rekexugixalopomaduvuri.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/91245121566.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/jijawisubolozujo.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/niwatoligupasisiritipow.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610110125d971---jalosagipelewiwazemuni.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/39224044e2baf681e4d6b2de1ca366c7/94047103936.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/kulewopafakenux.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607178f74a409---72110465639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=convert+pdf+to+ms+powerpoint+onlinePDF 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_off0000d671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 17544 bytes
SHA-256: 395f5a1fdfa89a61e11416980c21ee933af4c7ff4e33ba30e6a0a44c1bae7765
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 10680 bytes
SHA-256: 5a1b493150699e50beeeb0a0cd81a510317653faa08836299973e1a341a3a302

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