Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f5d7394d5f6979…

MALICIOUS

PDF

70.5 KB Created: 2021-10-04 05:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c7e1a9db62587eaea0a83dd9604bc35 SHA-1: f6ac7656f878f4f3ec3221b9bc9ea3b985afd8b2 SHA-256: d1f5d7394d5f69791be4170b7fd351dfcd45ae8a682d8d929646ad914ccc86e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm with numerous URLs, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://adamlegal.com/userfiles/file/31741156598.pdf
    • https://girilawfirm.com/content_files/files/82012521915.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613471b2584b8---59298782808.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ec35d0ac6bb14878d208a65ccf67121/dijizoge.pdf
    • http://geojeoceanhotel.com/userfiles/file/20210903064332.pdf
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/10760355743.pdf
    • http://owop.challengersports.com/ckfinder/userfiles/files/jozinapumixixinufixazo.pdf
    • http://macautemple.com/userfiles/file/59049361348.pdf
    • http://verkaufs-akademie.com/userfiles/file/11951090836.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c70ce3f4632ce63bda5782bed77faa64/73397324142.pdf
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/96095919278.pdf
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/nonapumotemulesizovapu.pdf
    • https://kingwrapcarspa.com/upload/files/buvajoferimaruzukevegazoj.pdf
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/zazilevinubeletepu.pdf
    • http://mwbright.com/upload_fck/file/2021-10-4/20211004010226953386.pdf
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210913_061810.pdf
    • https://casasholidays.com/scgtest/team-explore/uploads/files/37967783021.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/75211734203.pdf
    • http://topup-fight.com/ckfinder/userfiles/files/38075636978.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16158a27c4c603---8553485064.pdf
    • http://chokmanee.com/userfiles/file/80144756739.pdf
    • https://serka.com/serka/upload/files/gogozajuguvivugelejidugef.pdf
    • http://hoshitorionline.com/uploads/files/fixulaxivasexoganesigi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=calisthenics+workout+for+beginners+at+home+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_off0000b282.bin
1eb7edb0949e572f822e9b0affa596d3a2ddbead8f75e2c9a19101af56cc1de5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB282 15408 bytes
font_01_sfnt_off0000d956.bin
79d4e226d914764338a200935330e72e82cf7e5acc72871b2c0fd645a34c69c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 11516 bytes
font_02_sfnt_off0000f417.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 16792 bytes