Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9644adb21a96eb4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 06:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c76370b0a992335185434060b3896be1 SHA-1: 0a2d2b11d664e4015b98fca69fdf24b9c49ae934 SHA-256: d9644adb21a96eb4a979b9be5107a91453a68b5bd1c4bef656ba127b2c30f563
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dangeloremodeling.com/nbloom/fckuploads/file/24160981499.pdf In PDF document text
    • https://adamant54.ru/userfiles/files/teregi.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/3587753318.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/fakekizinajobo.pdfIn PDF document text
    • http://boldogelet.hu/media/dusagorezajanus.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/63a6ab38e03f90d594fce343c3c72d9f/86394551467.pdfIn PDF document text
    • https://titishop.co/upload/files/52955244089.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210908/file/16310348868793.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/mesagobaligenolez.pdfIn PDF document text
    • https://comfort8889.com/upload/files/24366104209.pdfIn PDF document text
    • http://dhf-china.com/d/files/73638988639.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/vipasopegivofu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f32877467---39271376466.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/54985960180.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d86370d34---54615655857.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210902122310.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/375bba386dcf02f872d238e4f88f09b8/17533921796.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/zawefexatodev.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/puturonepunaxuromesu.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/29975922823.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/47574546164.pdfIn PDF document text
    • http://cityfate.com/files/files/wazopubanidafugulewovujo.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/jedibitokanivifalafup.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/8790189896.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141f97fb6619---94651751024.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415dde76442---56298407880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+file+ppsspp+god+of+warPDF 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_off0000de56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 17744 bytes
SHA-256: 7d1d558445018afa42f5bbbb8c8190847bbd0bc7a42e205ca8012c787453c631
font_02_sfnt_off00012460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 10664 bytes
SHA-256: 49c64c6f58937083f6f5540bb5f43a3370431452d13a4f41b8096d87113d51ff