Malicious PDF — malware analysis report

Static analysis result for SHA-256 8016b0e171b6d8f0…

MALICIOUS

PDF

76.4 KB Created: 2021-09-13 14:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d2f746a632d91ad410848b93bf542324 SHA-1: acb5b37fc226f6c8333d6eeffffa7837b61fa111 SHA-256: 8016b0e171b6d8f0d54b799332d9b93e1603fcf6e059fcc8047f37b2bcb3f1d9
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=6+types+of+chemical+reactions+worksheet PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161367e7a84226---topobiretalaz.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/nukufepez.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/59093551968.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/perogixusife.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/vowopibukuwafi.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/bojuve.pdfIn PDF document text
    • http://remobudostol.pl/pliki/7822045561.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/jebira.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/balotakomotitexi.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/39885749841.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/53722435605.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/tilaboleluxalefuwi.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/58473389032.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/34414939753.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/takefomawi.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/silarotewubidawevejupojam.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/doxipupiguwuj.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a7b11e23a20a536279a1d67f82c1052/1462138776.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/30272014889.pdfIn PDF document text
    • https://onlinendttraining.net/files/33780628593.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161318607a9889---72045225048.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/gividuwajit.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613649859f249---11344481541.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_off0000c6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 16880 bytes
SHA-256: 39681d128de7c146eea6f3fb880380a0cc34d58d63d035d39a57b55ee0c75f02
font_02_sfnt_off00010a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 11108 bytes
SHA-256: a3d147950f64fd2cfd845bb295bda7a4468f5cc374f3be4ddd57a525978813cf