Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb90743ef29a4e84…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 08:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd7338cdecf14f1cc23a64be7efd6c74 SHA-1: 50f3bc05452919e7f5b43c23b399cf1eedddc381 SHA-256: cb90743ef29a4e84cce76ecdf0f74e3f99967275684722660b5d81b994fae2af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, potentially leading to phishing sites or malware. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=your+just+being+cynical PDF link annotation
    • https://strategieb2b.com/userfiles/file/wokazupabukilawigazok.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/75874080310.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/sixepeparumabet.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/26330345286.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ff207b768---gerebosolipitijubone.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7326129d4.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/rapejobatinilojugibadokap.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/96840419972.pdfIn PDF document text
    • http://winso.tw/userfiles/file/vajigamuzirisuxamakife.pdfIn PDF document text
    • http://calisnt.com/uploads/files/fejefavegowagovenopu.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/pezudolo.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/88150124100.pdfIn PDF document text
    • http://pi-consulting.ch/download/tupudevolozisim.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/rezepixokogotajudogapi.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/0af46364bb9349766a92b5b30d722c07/7457734337.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210717_024401.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/98981846998.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/zezokusopesugumija.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/76625486341.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/7251785523.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f5b5749ed79eb20426c84153520f7070/15942173671.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/xarogagerixodad.pdfIn PDF document text
    • http://hidramaco.com/files/files/sivedowu.pdfIn PDF document text
    • https://quangcaoxetaxi.vn/upload/fck/file/nokepijosilogovabuteniso.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_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 18080 bytes
SHA-256: 871ff154866741477435b0bfafb168ab6832c5e67d784c79978340ab406777c9
font_02_sfnt_off00012f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F80 10872 bytes
SHA-256: 374cd882217cd8dbc99e2eea71f8991dac88405a8e9a4e09e8f930081f620ef5

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