Malicious PDF — malware analysis report

Static analysis result for SHA-256 07e1493485ac697e…

MALICIOUS

PDF

74.2 KB Created: 2021-09-07 03:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b8a0aa978eb03b3b690433c900390a4 SHA-1: 31af821c7c319fa8100810bd8a7665a6bdecb579 SHA-256: 07e1493485ac697e8e7cee06db54a60e7f4b267dad59a03d73a87aa230894290
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=net+tangible+benefit+worksheet+fha PDF link annotation
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf9fbed23---3300216083.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/29144016286.pdfIn PDF document text
    • https://baptistfriends.org/media/zarazerozegilesiviwo.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/wolekugojawilutel.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/gakegutumoliw.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/17406094594.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/32479731335.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/abbee8d2c871b8ef42797c25b655962f/77190025936.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/0a7adbf3b9475b59ed78977bd3aa87cd/sisirite.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/zatofi.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/56624586916.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/lofijawotimotoze.pdfIn PDF document text
    • https://schmitz.cz/res/file/88682527203.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/97744635104.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ee93dc671f3---nuzanupepagufa.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/48891021321.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16090714303ae5---bulabolorarilasejafos.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee92b9bc4d8---59609755518.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127c9765363e---27795000260.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/3838916617.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/rozozezozizenonufi.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2fac9456c---25796405066.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_off0000be5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 17052 bytes
SHA-256: 31fab32e67b2d7285ec1e16b014a3ab141990f5fd0dedf9af41c33eafdf3e40f
font_02_sfnt_off000102d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D7 10788 bytes
SHA-256: 7c3ecfd1159de4bd04a381b41e01faefeed6331af5e565063899c4a9d9c412b3

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