Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf8c1621eb93097…

MALICIOUS

PDF

111.9 KB Created: 2021-07-02 03:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e26963c05ee70037698015127af8a3a1 SHA-1: 221ec346e0faba94e1e91bd71513c1f77b11bb01 SHA-256: 2bf8c1621eb9309708b79a9c0137c78a12d619a0cb802824f03e4527932d89b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites and utilize formcraft plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the link farm structure suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://philabc.ru/uplcv?utm_term=evolution+of+life+meaning
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f6d628a0c---19515297834.pdf
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/51290674365.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4fc7ecce5---4108967892.pdf
    • http://chinamakina.com/userfiles/file/xizugisiveja.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b826f87c88b---77618109882.pdf
    • http://apisicul.com/userfiles/files/relok.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce263b3a5d---45423422580.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/27496648751.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/q5ds5tkhc7f7h3kci6fdjed7v5/59735249839.pdf
    • http://jarosi.hu/files/file/46668949202.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0b5cb855dd7d894278182d5a4fd61716/61294515581.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e9564aa2c7812ef1593dd25a1a49596a/tasuvur.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0c342630432173cf45428b6fa268a122/nifodorudalop.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf7ada27e---sukokuvit.pdf
    • http://makinsushi.com/uploads/files/nemezaxawodugelivo.pdf
    • http://be-now.pl/userfiles/file/jivaluboxilepaworetariv.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/2bbb2d5a4026178f4835c43d8b52021c/85032829093.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ghapbhktmcr20ie5768hh9i1ra/gojupibepusil.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/425627f6d1b60f6b1d17cc134097974b/47848716663.pdf
    • http://kimhoatra.com/upload/fckimagesfile/44883644602.pdf
    • https://mfdesign.hu/files/file/litabilipiziwafezujib.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d72a4eea4d4---66988602659.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921911d51e6---19915954556.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00013b9b.bin
5c245c13fd8035cf4e1c706da2859d91cb0661c4e6e92a1aa3a66f452bf54d9e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13B9B 29116 bytes
font_00_sfnt_off0000facb.bin
b70260aa29335f42605ddb8d1c51c8cf9683b8ed2a1b1c2e1ad1b8c06f48754c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 27548 bytes
font_02_sfnt_off00016fbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16FBF 16792 bytes
font_03_sfnt_off000187cc.bin
6f781b336e5be961390ca8d5134a5f64de622a7454ab829179eeedabc8e18235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x187CC 4992 bytes
font_04_sfnt_off000199f5.bin
b1ee7d8b7e72c7ae3cbe1ff95b7805c32399471aef0235e021fb108d47d5983f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x199F5 10436 bytes

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