Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6f336071c16a17…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 13:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fc2d4fd16b51a41c4a5537cd1f3f73f SHA-1: 5a680af4dab1e649bcc668f2878d367634ceee65 SHA-256: 0a6f336071c16a17885f279971477de7e22d5d5f95fb8bdb1b3357816397114e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, with several heuristics indicating a compromised CMS upload and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution by redirecting users to potentially harmful sites. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://zanethompson.com/userfiles/file/20827379413.pdf
    • https://tonmathunglan.vn/upload/files/bafamusefop.pdf
    • https://szabolcsipeter.com/userfiles/file/kotenajudax.pdf
    • https://nistd.in/userfiles/file/21696981687.pdf
    • http://xn--80aesyq.xn--p1acf/files/file/89222841868.pdf
    • http://stphilomenaonline.org/userfiles/file/98761723498.pdf
    • http://bygreenpure.com/userfiles/file/nekebimofuvip.pdf
    • http://targhevaticane.it/userfiles/files/mipadosemem.pdf
    • https://relans-nn.ru/images/docs/file/maziroxabixuporijalel.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/90156646865.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/618iuvlnnrntsnjakv06dg6d5f/sofupilamugifipova.pdf
    • https://alternativecarrepair.com/userfiles/file/87459958228.pdf
    • https://citronel.com/userfiles/files/57701128297.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/45220946703.pdf
    • http://csc0851.com/userfiles/file/20210908200526_odpuc4.pdf
    • http://gdfsztal.com/uploadfile/files/kudijurefebato.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16140e45b1d84e---12058121017.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6e0af172---zowimajozaxukade.pdf
    • https://betsin.org/userfiles/files/44132203948.pdf
    • https://curvy.tw/upload/files/55982535811.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/211f8420399339f64dfaf4ddd5ccc4bc/wuvaxex.pdf
    • http://plncse.hu/php_data/file/xoxodikinepivosatug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+harvest+moon+ps1+android
    • 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_off0000bba2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA2 16792 bytes
font_01_sfnt_off0000d3b4.bin
e18a73c9b8ecdb0c5c99c9129b9b878b4a2b7f0afc578fd5f3fcd323c6da079a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B4 17064 bytes
font_02_sfnt_off0000ffe9.bin
914def2e56faf732e1ddef76f75e5605a25fc2e1bbd8e8924da69c06265fed5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 10860 bytes