Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37c81d2e03d3d4b…

MALICIOUS

PDF

85.6 KB Created: 2021-08-22 01:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b0b4f50504ca29caba02c4be5411476b SHA-1: 09723d00c839071e8876df9e8c455cb26e6bd3a5 SHA-256: c37c81d2e03d3d4bb38fc7f6730306957ee8422b4e9ce312afa6a5a7c5d7bc9b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URIs pointing to compromised WordPress uploads and disposable domains. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=what+is+the+dependent+variable+in+this+hypothesis+quizlet PDF link annotation
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/8d7e01ae6969f4707736b898833939fe/15177727406.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077436b414f5---33976385767.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/95638293999.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/dizij.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/lazanirofan.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ea0b8b2764c58a30d19782d60b96448a/disuze.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/92690581980.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17561602052.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/fotodiwuzulukebakewi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf489748e8---3321727119.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/30261804664.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/nezilinexanevefo.pdfIn PDF document text
    • https://stauber.lt/images/files/68675239242.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/697a4577eb07a6e64ea3d042c2d7d1be/55706131464.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/79552008497.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607386650b6b3---26034330790.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/30102392404.pdfIn PDF document text
    • http://foodchemsino.com/d/files/lamuzesalepumupu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/lsim9uil08e4gci8nn0jjhr6tk/62030319762.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/silupewib.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e35e3c0e04---83843975838.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04042c92be---fomodutawuloxofine.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/6e8eta294f50pnsv4idclpmrvv/livixak.pdfIn PDF document text
    • https://unitjaya.com/contents//files/59011915484.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/9223139019.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/29e4f4061ea86cb34cfb1afd48304c8c/jugefezurudisevapopunekij.pdfIn PDF document text
    • 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_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 11108 bytes
SHA-256: 91605d27a452a9ad50d1a6cf41bfe1d65dcc8d1b14184014e00d087c7841094b
font_01_sfnt_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 18832 bytes
SHA-256: 6bab7deaadcb41aecb5329f3df9c5b2f85994c5ddfb088a824383a9fe1d7ab7a
font_02_sfnt_off00012d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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