Malicious PDF — malware analysis report

Static analysis result for SHA-256 a681bc5ae9e919a6…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 22:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab19f7edabe4ec2213c5a1b62e351827 SHA-1: d1bc5bf57a9bea41ca2bf58782b867fdbc19c996 SHA-256: a681bc5ae9e919a6bb30a6f9adc4f0c93b75ac3f075dde73c5977862bab9cc13
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing or malware distribution intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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://philabc.ru/uplcv?utm_term=family+farmhouse+bloxburg PDF link annotation
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vsgscjp236c5g8vta6ahqh4us4/50518216937.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/vidusiwakij.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/zexibejudexofalibu.pdfIn PDF document text
    • https://ivanamihic.com/files/vugenobisijozodowe.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/xokonatelijelatojisosogor.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/muvix.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/puselus.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/kesovetebefogupofapuwox.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/ritataje.pdfIn PDF document text
    • https://agermag.ro/mm/file/93880068687.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/88400288436.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/fedobozagalari.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/rulasuvew.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/nofepejidemubap.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/76371942193.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/zutikigepagafavotamubegoj.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/kinaj.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/dikaxiresabozifipudivogat.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/35013103647.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae6526793---norowadejaju.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/78141221100.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612efdbc7e9c4---wimuligipumadez.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/22428607925.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_off0000b8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DB 17224 bytes
SHA-256: 15ee06e90995ced87834001548c8087ebb8af4edb7a6ed2cb37c39e6e5af57a0
font_01_sfnt_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 10892 bytes
SHA-256: 6976b8654f0f015b3f823053f8a91e3b1f272d87847628c8ab9a852f80a32e87