Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2910db096571e4…

MALICIOUS

PDF

90.0 KB Created: 2021-06-26 09:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3e3857f5be5e07f217775e5609de186 SHA-1: 1aba735f4b130fd3b012d37ea74ec3796439067e SHA-256: 1f2910db096571e47f430ca0cc98fe1f4ae91d64b8e1dcdaa09a06d25c0e067a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of 'utm_term' parameters in some URLs indicates a potential SEO-based lure to attract victims searching for specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=cbse+class+10+science+book+chapter+1
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8c3c5fe7a794ff56240b7d9a1561808a/vekaguroratituwafevi.pdf
    • http://aytekinpolatel.com/image/files/75039099923.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/2980c6bedba34bf2fc43189b8a5dbb36/10336481939.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160943e4d057c5---befirido.pdf
    • http://musorcentrum.hu/files/article/file/23701791180.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/70a240e668b82ac5b724e2f333520a6f/banidigigoriv.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7555f713e9---kamafokil.pdf
    • http://matstravel.ru/userfiles/file/23991381416.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/v7m4vv26m7bqvvhpgu2svnedpr/zebijatutamuvavigo.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8977c6393---kavesaxurivipatogavuno.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ulsmk4kv30ie6b09sd21t0luc6/fomexuno.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16091e4337f64f---83068031313.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6423f2a57b---79219652434.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/48443774154.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/c2482lfrufqn5n0ons2bbo3e23/romelusuna.pdf
    • http://automotiveenergy.cz/userfiles/file/nakalirezalejebodixemu.pdf
    • http://dgjinhak.kr/DATA/upload/files/202105310142482931.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3640960a3---3577266698.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/f46c896e5c2f530bf15866574bc2cf97/59237572611.pdf
    • https://ajitcoatings.com/uploads/wesexij.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b33c8096---19751877474.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3eae0143ea21602f64f92b658107e1b/92418592612.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160848e2d2095b---dugugiruzujadoz.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f43ba5030---1878075249.pdf
    • http://aqbnb.com/uploadfile/file/lopunij.pdf
    • 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_off0000fa7a.bin
15ab79fe5eeb51f102d8c32d9bcd897d7f5a774fe2c0cdf61389098eb0fbedb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 17796 bytes
font_01_sfnt_off00012980.bin
4d4fbb4f9c718040436898212ac2fdccd4b42df465f86ce3c80a7cd7faebfa68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12980 10908 bytes
font_02_sfnt_off0001427f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1427F 16792 bytes

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