Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c38c0f70e12c2a1…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 17:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a384613862276d47250a73cb563656d SHA-1: d3d9e8dcb5143d9d0f964859e53afc069d6a2057 SHA-256: 3c38c0f70e12c2a1e1d6765f5906c363ab25e67ffa68826941b414a36fda469b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=contest+of+champions+mod+apk+unlimited+everything PDF link annotation
    • http://bociany.sk/media/file/65728407183.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/49963848998.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/nigikutuludofefavu.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/61466349749.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16142fb9ce5a10---boxajejumusedetefuris.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/37506968454.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/nidunukiwowowa.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/74288569271.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/67794714301.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/kopamojutekofiwizug.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/vosovadutofarojotaxijine.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a7bcab6db8f8d627123b7c43e274ce9f/sofulibijo.pdfIn PDF document text
    • https://esz.jp/img/editor/files/xudekuro.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/barabowupumidepubabowuv.pdfIn PDF document text
    • http://www.moyekolodin.com/files/81107938281.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/rezejesinavatamo.pdfIn PDF document text
    • https://diphong.com/uploads/xeduxilimabotobokesi.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb759378ef---nodovinumewanudexo.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/3433922642.pdfIn PDF document text
    • http://midospa.com/upload/files/gexizimonirulexibisubuwa.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/gatijozerugapeveb.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210911115751.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/lopurirutekadetodixibipu.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_off0000ca4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4F 17400 bytes
SHA-256: 84808e7b41e053ee8ac99939c2da59dc0dc10244a5273c3081aca17c83094cff
font_01_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F63 11468 bytes
SHA-256: 1af0d633bebd0c64333ef88b8dc46b4d62728acf2cfee1e345077d2d0e38ef29

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