Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba5cac317c4aafc…

MALICIOUS

PDF

74.2 KB Created: 2021-10-05 13:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c6133cde48538994c0d02774ffa92ca SHA-1: 56970af4375cc0dd890f2c186cc379780ae3a54a SHA-256: 9ba5cac317c4aafc1de4cf0934784ff1b4eb797296e85178b1816fc876d9ca78
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cyberbirddog.com/userfiles/files/54416937942.pdf
    • http://namuvaldymas.lt/userfiles/file/kojes.pdf
    • http://psychologadamczak.pl/userfiles/file/keletogizoz.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcd2329ece---54833281125.pdf
    • http://lamekatus.com/uploads/ckeditor/files/bowatirewulidasofiked.pdf
    • https://bonekarusa.com/contents/files/29307569441.pdf
    • http://ideviceplus.be/app/webroot/files/userfiles/files/253924418.pdf
    • http://nut-shell.net/upload/files/vulijokawuwuvinusute.pdf
    • http://app0.linkeo.it/ckfinder/userfiles/files/varet.pdf
    • http://aftckwt.com/uploads/file/856186226.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16157f9214f675---dubukema.pdf
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/botovuwed.pdf
    • http://airmon.hu/images/files/mibewegadavewajigopu.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/97d62c92c7fdcd50ef7fc675920990c8/wezabadado.pdf
    • http://nhakhoanhantin.com/media/ftp/file/70821703121.pdf
    • https://moscreen.in/cmsfiles/file/92508256391.pdf
    • http://jj-metals.com/userfiles/file/2021092410103573499.pdf
    • https://wegofa.com/userfiles/file/27866310293.pdf
    • https://dla-pracownika.pl/pliki_user/File/84518215371.pdf
    • https://egyptsuntours.com/userfiles/files/7422514664.pdf
    • https://billard-hauri.ch/userfiles/file/lilejekexopasa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+install+plugins+minecraft
    • 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_off0000beee.bin
a9bde52be08eb86ef8e2197a2fea9a40fb058589e552e55f830287a6d13786ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEE 11000 bytes
font_01_sfnt_off0000d87f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 16792 bytes
font_02_sfnt_off0000f091.bin
f0a6b35932f7bf0e6cf2462b44d8891f96c55ec475f89717c926db145f651258		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 16592 bytes

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