Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e8d02f5524b037…

MALICIOUS

PDF

93.9 KB Created: 2021-09-04 06:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c41a568b771db0586ca47d8f78e3f3a SHA-1: f7798433a85df5da955b8638682e2889f5846942 SHA-256: 88e8d02f5524b0370c6cea543ca51cdf9ea655f742d6e9cc60013f3326e5bb78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs that point to compromised CMS uploads and disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=s%C3%A1lvese+quien+pueda+andres+oppenheimer+pdf PDF link annotation
    • http://westfallassociates.com/documents/file/30359530082.pdfIn PDF document text
    • http://tano-cable.com/d/files/zoresavusifuxepawexapasu.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/28328381894.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5fb40462a---nikivopewexabol.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/gofobanomawizepopanov.pdfIn PDF document text
    • https://petikdaun.com/contents//files/fujazedupesozawidijatux.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/32750397571.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ok39712g1bagad8o75iao3ts12/90258111398.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca2911568---34731562711.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/5rq6o3hik22hhn59bavhpc4nne/zudavaxidogad.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9b7dccce---43380598251.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/jivovunotebubomesinewuf.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210611_10B624372D58B926.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/48984816151.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/bb1d3a93f8ce3114c4a6c47630f94aa6/78395168536.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/jexosixi.pdfIn PDF document text
    • https://sitarasign.ir/data/file/vazajurasexubifagolofu.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/wijiku.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160813f9a711b2---96506167159.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/zugigujufosesu.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/waruvimewasegajegulira.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_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 19740 bytes
SHA-256: ac245811a8d94d30cf5867310e7b3b05d90bd82b7118eb9e5e2d45fcc4cd0fdd
font_01_sfnt_off000135f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F1 11232 bytes
SHA-256: ce95c15069da16924919e6416d4847389e83c7db450453dc9d8a6d99638637fa
font_02_sfnt_off00014f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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