Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a62a91e941d08d…

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 07:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8d557326c83d42f4ff457475b7fd2e91 SHA-1: 6052bbae1992d3765ca0ede5bae6a0f9bd55636d SHA-256: 23a62a91e941d08d31a11ba951f1a9ea782eddf4af3646fdadb39dd5f35cda62
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs and link farms pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are embedded within the document's structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=composite+shapes+worksheet PDF link annotation
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/juvewoxakoge.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ee3tarkeerrl9mficertqftov8/lonipulumuborowo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4e82aecf5468a3f3cfc233ee8041b14d/tefajomox.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/zoxawosan.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e854d7bcbc2956fad7fc281219e8162/faxofuxikugobizaxubul.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/40878659405.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/tepogab.pdfIn PDF document text
    • https://arerp.kr/data/file///sewegarasiwezepidipaxomit.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/xowozitetojejamuzi.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6d7f62a89cca0d94639715bc09ad4f59/63954421789.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/71952145888.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/97764990646.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b077819ba1---budagufuwibagedukixu.pdfIn PDF document text
    • http://sdes.in/uploads/90320047984.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/gosajokaxikopufut.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0bd7b8c277cbeffaf77d7871f299332c/kedin.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/1ace21809bfd441c9710d634916c2aaa/mivozazagudoxofivel.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/ladakifixidujafelajor.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/xuderaruxasukiz.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087c14db113d---58464767077.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/zokurugela.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/67184847546.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/kolesut.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_off0000be62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE62 10576 bytes
SHA-256: 24b8198b7d8b33872144f1c0d846b1a4d2515b9bbddc4dbf5cf2407fd336421d
font_01_sfnt_off0000d6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 15436 bytes
SHA-256: eb701fd54b7ecde69be8275360b85508785572154b5459dce27a9bd7f8f954c6
font_02_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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