Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca55c59e3425701…

MALICIOUS

PDF

70.8 KB Created: 2021-09-01 18:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5c70effe31b2326a421b4daf6b29b7a8 SHA-1: ef358880c2c4f65290786d893d082fbacd8f5d66 SHA-256: 5ca55c59e34257016e6ab6340586047cbf6eb99df18b141ddc83945ada29984a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, identified by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae747e2331---todokilitisekazunemej.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124bccada463---papixufutuxezifipe.pdfIn PDF document text
    • https://binhvi.com/upload/files/50961704692.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a614954af75---mukamakenoj.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/jidirimoziporini.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b9777d94d---wekiwenosotoxe.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/bf9491e7d508798710f9a6c980e6513d/tupujoxosepenexavuzukuf.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/73237338435.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/41797775795.pdfIn PDF document text
    • http://valeneighbors.com/userimages/zibok.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/pewepo.pdfIn PDF document text
    • https://ferropula.hr/files/lafopefelifoko.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/duxug.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609068c3e4913---pujobe.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/c706ef1776d63b69025a2917f4953116/vuzasepuguvejasemu.pdfIn PDF document text
    • http://usmleworkout.com/files/file/zakuzadupojabovi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d2079801a---wiridonaveredo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f4c9a27b1---wufedogixatis.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/dukenilokusaxozala.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/27651615827.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d8705a8dc8fd8df4fc7a93aab590f0db/xalerupatokufibezufotal.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/83326778982.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9006361353---foronafewokumoxor.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609670025a79b---pufibagimo.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/fatidekuludijoxodubuzagal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=footer+scroll+with+pagePDF 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_off0000b7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A7 10612 bytes
SHA-256: 370534dafadd409ca9b0e1f5b41c0368269a23583ea4c3bd38f985e61b95c619
font_01_sfnt_off0000d028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 15396 bytes
SHA-256: f663282f606608376bcc23b8e7b999e33b796009cd7ef8f1e0a1586ba7ecc924

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