Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04e0980dbf9517d…

MALICIOUS

PDF

79.8 KB Created: 2021-08-18 15:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66249f61ed0bc333d7f49f8f8b66abe1 SHA-1: be3f42069c9e6277fcdd541862fa44f513833f4f SHA-256: b04e0980dbf9517dea3a47e60f4cbea7cf56a8c2ddba2139310e5f6a74ffac5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://iweldbot.com/ckfinder/pho/files/denepa.pdf In PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/84587031156.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4kgujmcut3bns6m30mdmivcfkq/59150435880.pdfIn PDF document text
    • http://gerocuki.hu/user/file/62902083535.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/71110314073.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/10860138365.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/60583043368.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f778c9b3ba---79403798044.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210628012927.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/favawunawutexevev.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1db0b51f---buzanikikewijuwuwanorozo.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/64529453417.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609747ff2e87a---keliwoposolejemu.pdfIn PDF document text
    • https://flyags.com/editorResources/file///vazerifujiku.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/zinosa.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/18564850720.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/71475599161.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/kugojokax.pdfIn PDF document text
    • http://vina2002.com/uploads/files/12982988695.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/5908614739.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/dupuwuxogowawavijut.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a483de8cfb73d7247283924ea4ef3f27/vidaxipugetunozolokodut.pdfIn PDF document text
    • https://t2sc.me/userfiles/naronowagufonakut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+the+oil+in+a+sears+lawn+mowerPDF 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_off0000d4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FB 10752 bytes
SHA-256: a7dd7ea1ddf0e3a85bc207471d2a3f4d762521ec5cca9dff4d2e907be754ea0b
font_01_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 16980 bytes
SHA-256: 1b45cda099311bfcfd2d8496c6e7706667d4345d7797473c5d9f6089967db149
font_02_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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