Malicious PDF — malware analysis report

Static analysis result for SHA-256 475f6a5806ec4585…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 19:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24fc47c70393cbd95e8aeb3de8e73118 SHA-1: d66f52399c3bb8b1d8759f09a029e53a7f993225 SHA-256: 475f6a5806ec4585f30e9e8c8412652febd3d726cb31ff64ee830fb18040dbb6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple embedded URLs pointing to compromised WordPress sites and other domains. These links likely serve to obscure the true destination and potentially distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://imobilestore.de/userfiles/file/19322083060.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131018b709f8---76503932317.pdf
    • http://cka-shiba.com/ckfinder/userfiles/files/22800626264.pdf
    • http://samocvet.org/foto/ck/files/14295348004.pdf
    • https://emotionalgift.com/ckfinder/userfiles/files/47349785947.pdf
    • http://batiment-tunisie.com/userfiles/file/nanebumazokanulovuxavoruk.pdf
    • http://limuzine.md/userfiles/file/xanifofelolumiwusapag.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e19fb2b39---vibajip.pdf
    • http://gryfarmerskie.pl/pliki_wyswig/files/28776488060.pdf
    • http://stin-verdon.fr/assets/Image/files/92879246580.pdf
    • https://shindah.com/images/ckeditor_img/files/zerixukebudugazezev.pdf
    • http://yibetter.com/data/files/5713592369.pdf
    • http://jungam21.com/upfiles/file/1630490303.pdf
    • https://cokhivietuc.com/img-vietuc/files/41369975967.pdf
    • https://incense888.com/uploads/files/202109060920412142.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8863df44c06c9b1d375359b247abdff9/65073387411.pdf
    • https://spvi.cn/filespath/files/20210904232655.pdf
    • http://pantipplaza.com/userfiles/file/48078832462.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc2de9fcc---bevez.pdf
    • http://somsit.com/ckfinder/userfiles/files/92596500952.pdf
    • http://ackerviewguesthouse.com/userfiles/file/zidavulegivefuk.pdf
    • http://koutingchina.com/upload/files/91169674438.pdf
    • http://giaphatmed.com/upload/file/80310914295.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bwt+magnesium+mineralizer+manual
    • https://www.thc.gda.pl/ckfinder/userfiles/files/kasiwolabo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 16792 bytes
font_01_sfnt_off0000ef13.bin
22ec3e9244c344049074d986976ccb4b026995e4e374264c3347a3c90a4f022b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 10632 bytes
font_02_sfnt_off00010778.bin
9bac99e02d6c5dd8863cdc577b75a17931b81cbd4f78ef882cfe12a9e210fdd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 18872 bytes