Malicious PDF — malware analysis report

Static analysis result for SHA-256 48716e558f782778…

MALICIOUS

PDF

88.1 KB Created: 2021-06-26 16:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6380109d946c688922b2920378509841 SHA-1: 65ad2fa3f1e522e405c94099b6371f8d564c3615 SHA-256: 48716e558f78277876fa5152bede458b1a4c04c8206f51132e798b6ff357a6da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://kiuruvedenlukio.fi/tiedostot/file/84428866901.pdf
    • http://americasbestmanassas.com/uploads/files/xerokovegitajabixubejak.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803546c6c23---21096791482.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/62jht8vhv3s41o9rrojd6pruau/38273594335.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba85daa94cd---gubiwenegufinok.pdf
    • https://audreyheselmans.com/_files/file/14301325907.pdf
    • https://asi-filter.pl/files/file/47805057148.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e4bcdf4ad---fuxisijuja.pdf
    • http://acpiindia.com/userfiles/file/vegenasuna.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce52281fa9---xozuwamar.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/94588884326.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b6564068c---diziruwogasokin.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608655c7cf7a2---87077118110.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160babed098b38---7354905851.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7cecc64f4---96839052296.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092986a40770---solonusefuloselixekaz.pdf
    • https://luminex.pl/upload/file/pasawoxakabolulojisuxudov.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afcfd82ac26---71277870636.pdf
    • http://zhengfutz.com/v15/Upload/file/20216201038342337.pdf
    • https://iwnta.com/userfiles/file/25025020657.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092127bd5401---mazolunotasokiwotixibolaf.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/03p1jfdok0oeps2h2r7clavhdq/medutagufat.pdf
    • https://mariellatriolo.it/public/file/3942695894.pdf
    • https://peilimineko.com/userfiles/file/tibexofoxosul.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/922a5b8e6a575cf09f669df0f3847ea1/pufele.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085592fe5e69---paliwokoli.pdf
    • http://security-m.jp/tool/images/file/26334146317.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=house+with+garage+for+rent
    • 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_off0000f60e.bin
469393b034f7ed291e5f85032e199bf9f92d14e9f7566f28a925a8b28ad99cfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 17072 bytes
font_01_sfnt_off000122b3.bin
dc19eeca63a8255208bc779e564d0a8efd8baf543f265d268bc4e367cc3b4ddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122B3 10624 bytes
font_02_sfnt_off00013b11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B11 16792 bytes

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