Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c51b85b4f0ee999…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 20:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7c0c58b73ffaf79a45f17b6bb2e93e25 SHA-1: 984a82f5f8c4d55954ef8df2d131a1681fa9823c SHA-256: 6c51b85b4f0ee99976a8ab0025fe26220c178fee8cf5ff892e6b56397d4aebf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faafd04173c---perexegoxa.pdf In PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f160bb832---35813234537.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/c9e9b5e0cc45e0d1d9b0747e4faa9e1d/12013616802.pdfIn PDF document text
    • https://yellowstonewildlife.com/98373988629.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/65876528470.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac5ea00d71---42114100840.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fadca40b8a4---veletulemabelomosaje.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/4c025837a7f7434a3ad609b7273055cf/71145584368.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/50506761251.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/vuvafadafirosusigamug.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/42109922167.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/84102905045.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/9588708669.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/ginusededupekukuz.pdfIn PDF document text
    • http://www.toptehnik.si/images/75037699484.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/483a5c1b2a2882176178c4876cecfb0c/59179584210.pdfIn PDF document text
    • https://beliangka.com/contents//files/zosupupirusofipizexub.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/bedoxawuvifidafefunel.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/bojexodixubekup.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/6mj9rl70a1cjcntntqg5lr9lcq/zevuj.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210503235058_1850830446.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160afd15a98644---rekasuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=clinical+social+work+exam+study+guide+pdfPDF 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_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 16240 bytes
SHA-256: de615b8c52b917f757a55ea4a18274f6cf2da53ead0f02b851286b971c03b6d2
font_02_sfnt_off00011ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 11488 bytes
SHA-256: 24a850e7f5ed5d42abab08f8e6118fc363d4a7f513b1b68cb23c80aa2d326bbb

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