Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ff602930769519…

MALICIOUS

PDF

74.0 KB Created: 2021-08-22 00:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 63440c6c4dc022b77858238891027649 SHA-1: fdd12123290797b31ffead1cc232777715734038 SHA-256: e8ff602930769519a2b1904e2601a6d2587c609a027b8eaf0b0499d9bac8b0ac
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to other PDFs hosted on compromised or disposable domains. This suggests the document is designed to lure users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/aafbdb6127d0fc765017f5757a2fbe20/fupupit.pdf In PDF document text
    • http://mintaialuminum.com/d/files/4083683998.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/tasikavosum.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/66792022615.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/lv37p9mt4771v2c7rfner6ilo6/kewoxisiporepasexuf.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/15701499412.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd30413194---poredosujagisokik.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a18156b691d---notefunumu.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/26361659806.pdfIn PDF document text
    • http://ping-property.com/user_img/files/58009110364.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/9931291509.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/digixabu.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/cb30501a53c602e8ff90d2f39f146b4f/muragusezibabev.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/73547723320.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/soliwugu.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/tutefodama.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/jatovasowosaj.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/nufutepoluwidemitin.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/7975579116.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/67226163694.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8f712bceb---xirer.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911766599e0---vomanelateladixade.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/f2b455f04fc8fe97f7aadd7a60bcfd30.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fce+practice+tests+2015+pdf+answer+keyPDF 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_off0000bdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD3 16008 bytes
SHA-256: 734d761f18221b761314421d5bec761a4ff4544b0b293aa3a1d3a7e5895731e5
font_01_sfnt_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 11144 bytes
SHA-256: 2f2ef6ab482004aba5c4bd856615edbd6084dd16f0e545cb0086aabfa4cd9501
font_02_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1