Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce6c3baf1d956e7…

MALICIOUS

PDF

76.0 KB Created: 2021-09-23 00:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2073a7cdbc09ad0af34cdebf867119df SHA-1: dad2321e4214270a7d97e5be1dd866582622dd74 SHA-256: 7ce6c3baf1d956e7d7623b2153e9be20d694bd2c211dfe449652a11f983a3e5b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nwatchonline.info/userfiles/file/88452350979.pdf
    • https://foulardfotografando.it/file/24623656983.pdf
    • http://supermarketdv.ru/files/file/51028290189.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c00ef12bb.pdf
    • http://a-xian-coat.com/uploads/files/202109221249304515.pdf
    • http://flightshop.jp/images/blog/file/5528389751.pdf
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/josovazulobozuwu.pdf
    • https://grandhotelushba.com/userfiles/file/51730679417.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/57c42641bb561b3f2bd7d0a0482116e9/4622082720.pdf
    • http://tw-echen.com/uploads/files/202109100603377733.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/joxak.pdf
    • http://realtor-madrid.com/uploades/fckeditorfile/xafijikozeparotoku.pdf
    • https://www.karelo.com/uploads/File/wolizoguwobepepodiremoje.pdf
    • https://markmont.eu/editor_uploads/system/files/86346780161.pdf
    • https://vibanghanoi.com/uploads/files/17843808199.pdf
    • https://perfecthospital.org/FCKeditor/file/99685262344.pdf
    • https://thietbivesinhanhhuy.com/asset/files/kopopenuzediru.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132798605cc5---84601725304.pdf
    • http://medob.org/SITE/files/editor/file/bulosaxikinisakosifilodun.pdf
    • http://lionsmarsala.it/userfiles/files/39185751377.pdf
    • https://alzubidi.com/userfiles/files/laborif.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210906_021104.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=snapseed+full+version
    • 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_off0000c6d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D4 16792 bytes
font_01_sfnt_off0000dee6.bin
ebd15717071d79ccd014c50af19c782085ea8b2ebdacffc72d7b4884d3fd6fe8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 16904 bytes
font_02_sfnt_off00010a0e.bin
b52d10af1566a83b41729b58a8e7b1376f6c8a13572dcde4f6da03e0f59be9ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 10636 bytes