Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0100890289bc9a5…

MALICIOUS

PDF

73.0 KB Created: 2021-09-07 07:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f82a935294c5de0a5a1167be76ec798c SHA-1: 83d6cc1a971c0988cdde19442b33f53ab8979d02 SHA-256: c0100890289bc9a5457a3744a3b74e98d4a6294eaccbdd9e3996aa9e1f74e17f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially malicious URLs. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ketchas.ru/uplcv?utm_term=cosa+nostra+book+pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609798f48a6ae---13086861900.pdf
    • http://ibb-online.ru/f/file/77880252387.pdf
    • http://banner-ever.com/ckImg/files/70461547517.pdf
    • http://inspirationforexcellence.com/clients/66491/File/49920958995.pdf
    • https://branchennachweis.eu/userfiles/file/xebajuxitirupe.pdf
    • http://analogsys.com/uploaded/file/169625381960b3ca7dc8345.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/719db223192b1f0bf1c0d03769409738/sofajugodimobexanobifod.pdf
    • http://serting.eu/userfiles/files/lovitowanaditerebo.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7677dc84f---96277244570.pdf
    • http://leadershipcareer.kr/fckeditor/_upload/file/gujonutuni.pdf
    • http://altelaw.com/uploads/image/file/lubatowidegezafoz.pdf
    • http://wsm.hk/images/files/xekagupesivege.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611382f0f1cc9---xugijotif.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a424138028---76087175832.pdf
    • http://weifong.tw/fckimages/file/50796854338.pdf
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/rapifusebogibuvajuxufowez.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/60145870877.pdf
    • http://hopkins1983.com/clients/861771/File/52692912909.pdf
    • http://labonguyenhoang.com/img-chamthi/files/98802879811.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16116ec65317d9---29436954266.pdf
    • http://chpcentre.com/files/file/tavajujexifofovekoga.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c16c9f0d01b---74261747270.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/90599163287.pdf
    • http://baove247.org/upload/files/18117977498.pdf
    • http://citywideok.com/clients/75789/File/bitojixabijafomukowuwis.pdf
    • https://at2-turbo-j3t.com/contents/files/jexufodeg.pdf
    • http://ztkammer.at/uploads/file/vatuveg.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_off0000b9ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EF 16792 bytes
font_01_sfnt_off0000d206.bin
853143025f7961f68f1cd4a77264ec15b62c64e86a7df90f13620cfdb7180e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD206 10484 bytes
font_02_sfnt_off0000e9ca.bin
4e08fa74d1cbc7f0b57f624ff6913966bd6e9e7e13c80efc88699c26ffaee07c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 17088 bytes

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