Malicious PDF — malware analysis report

Static analysis result for SHA-256 487ea81f40181647…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 01:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f22bcc8f3ff02a84eca40f6899fd5c7 SHA-1: 75f9eb5f3d3ee285af5028b7b66e4443cee47f59 SHA-256: 487ea81f401816473aa3c2d4040b85e16e9140b6fb5c8f9ae68b52043fb62854
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites and disposable hosting. Heuristics indicate this is a link farm, likely designed to lure users to malicious sites for phishing or to download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://philabc.ru/uplcv?utm_term=apeman+dash+cam+manual+pdf PDF link annotation
    • https://aedwea.com/upload/foto/187286832.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/zusakaviniwo.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/natefuduzebake.pdfIn PDF document text
    • http://martonelektro.hu/files/file/zigan.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7d3593fa7---1661541021.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/23551614923.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/felexokulefava.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3bc933654d11f2bced07468874d26b2c/xemaponoxezug.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/rorikupekogotasororizu.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/96775565134.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/76052872457.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/80210668886.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/buzaweronisade.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7520daf63c4f125e26089927252cc081/91970951351.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/20851735628.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7e262139---gobuxawedigadokobo.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/tozanu.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/45735498132.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/nejupajerotasobo.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/bf9f87af20cc5c7d88594c71f89e8d79/dixelifixexi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096733c8e176---16209103551.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bf62a79aa---katawetomojizexipanur.pdfIn PDF document text
    • 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_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 10556 bytes
SHA-256: edb13e6294e731c9a735dbe7b4751e4ab682e56516706cf900238d436bc8ab22
font_01_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4E 19144 bytes
SHA-256: 8b413777d440453b1b233c67ef41d7c2c23e9eec63053788a1c7ebffefe6bbce