Malicious PDF — malware analysis report

Static analysis result for SHA-256 00733b33dbb56f63…

MALICIOUS

PDF

109.0 KB Created: 2021-08-19 11:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de2fa4ff7470dc52e2f464ab06d0a2a0 SHA-1: bb30c79c0fc3a00e8b5d647bec48647a8881e926 SHA-256: 00733b33dbb56f6399e05803b15086959381c497a93b778bd8b9ae4a98407317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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 https://inwebjor.ru/uplcv?utm_term=what+are+the+effects+of+plastic+pollution+on+marine+life
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53258210863.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/fd3a170a38896f9a8c6fd6c80fd8edba/10097480667.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/aua63v7g5e6k91ajdj2es84unq/58431826725.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072f32f3523f---waraxes.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160907a0f3fa51---bufegetafevakefatufuzu.pdf
    • http://afgventuregroup.com/cfiles/file/81583825416.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607625988ca56---mexikizi.pdf
    • http://dietetyka-24.pl/images/files/30984672922.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2487423aef04030b37256e12278191a5/fuzexozijejozan.pdf
    • http://zaun-produzent.de/userfiles/file/palarivizebowe.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/bbirgn5r9i7lpiuqqfit8bc2a0/figapabefozegojinoxux.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdc76ee313---22677100073.pdf
    • http://freewest.at/60909998769.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/k4jjg9lltpt92pnd9rpb65rnp5/jelomateb.pdf
    • https://serini-cloud.pl/uploads/editor/file/zugupanimapuvofisos.pdf
    • https://alistairmills.com/ckfinder/userfiles/files/jotasoxakim.pdf
    • https://bloomeng.com/uploads/20797945959.pdf
    • https://apotekatia.ba/fajlovi/30624741964.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fb2d2fba1---rexelatesibazavozo.pdf
    • http://hkwwta.org/userfiles/56110942911.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607304352a53b---ragiduzawatoloxop.pdf
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/milezuvafiwigipezow.pdf
    • http://profil-metall.de/content/uploads/file/kefexe.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082d08f81345---64958505472.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/subuvajegonesiman.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a4b977843---lovot.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_off000144ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144EA 16792 bytes
font_01_sfnt_off00015d01.bin
a116d1dcc86701446d21a66cdb8d5ac9239e23b90f07931700e1f861a527588a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D01 10840 bytes
font_02_sfnt_off000175d5.bin
9a02555182ae44a8b9a42807a21558cb038ffc3b122f77cb1c0584222b142682
pdf-font-stream PDF embedded font (sfnt) at offset 0x175D5 17924 bytes