Malicious PDF — malware analysis report

Static analysis result for SHA-256 e251a0fd74d4b019…

MALICIOUS

PDF

74.8 KB Created: 2021-07-27 03:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce8d18d06157ae758c85c5209d186da3 SHA-1: d9116e04d4755e450bb680583215cf92cb008d05 SHA-256: e251a0fd74d4b0196a57172167eea178f2f45144ee11d85269c900ebbd9f6cbf
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware distribution, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://sanitaerprofi.ch/fckeditor/editor/images/file/gevuseni.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c522465f3---boxupuxuwijopipoziset.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e464dc5f60---vifujazap.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/busimagud.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff358cc3daa---menivoj.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/wavugebovow.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/pafuvifexadufokavewazozam.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/18457506710.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/fawimolobesumukitekikufim.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/163021219.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d8219f08e7f---68935743608.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/648fbbbafc6d622e8d2ef81fa9fb1952/tifosizupomu.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761d3ccf71e---59847168147.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/67812627239.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/b21463f93983ff07d95e03b137f22160.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/dsejtq11vhgcjf98ja4i8tpaen/puribebopubele.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/ziruwudopuvefos.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/66377885222.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f545bd7d1---vosigamuba.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/fedis.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f1992d675---vulaledebixeladazatos.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43865c195b---73449734854.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/fuwajuzidifigudewa.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf5ed99af---96449416539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=smart+bracelet+unleash+your+run+manual+portugu%C3%AAsPDF link annotation
    • 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_off0000bc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC32 18240 bytes
SHA-256: 66a3c004b38e8e5fc3d8f354c1d56b097aecfc4cb91f21eca9408e8f412aaa0e
font_01_sfnt_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 11320 bytes
SHA-256: db69c776d6c3b1ac7af0c7e012dc23cb7fc7c95cf2decd8e96fa11f35e9cc7fa
font_02_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1