Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f926bfea06a7973…

MALICIOUS

PDF

78.5 KB Created: 2021-09-21 03:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d065b625686b4335d4adc2e973d2e34 SHA-1: 83119bd97308672b0cfa4c4c3a4e1943d95f4fb3 SHA-256: 8f926bfea06a797318350c4ae4e12eb3931788233ed89e86e017c6cab476ee31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised content management systems or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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 https://coretry.ru/uplcv?utm_term=antutu+benchmark+score+app+download PDF link annotation
    • http://regimhotelierbucuresti.com/images/userfiles/69003137029.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/sumisakeperejirosaregag.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/94805266252.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/39544785817.pdfIn PDF document text
    • https://educhina.mn/editor/files/fuzozusirezu.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/sizixuvabojisubidoxalomaw.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7844b0183b960d78dc34dbfe41775b58/97803273361.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/begazeroxut.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/29514823773.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109102352581695.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/79383809983.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/dibokari.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/wejigofakaxezaje.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/72382762867.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/woxodebidevuwunaxepowan.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0df862ebe---napafipavevabinikin.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/rakavorisusir.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/soramekanipujok.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/44497188883.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/67163249229.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210916_DC3885709F3B97B5.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/jatemavutuvesosumaxan.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/68687889959.pdfIn PDF document text
    • https://wonkingchina.com/d/files/duxaxijorolube.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/72cfaeaa0cfc2f71784bf8b4190cdc33/dezejote.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_off0000cde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE0 11088 bytes
SHA-256: aa1ec6ca69749a488359bc50c20bda976d76528a240e4771030aca4715ccf1be
font_01_sfnt_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 17304 bytes
SHA-256: e1520f87f41f8131c55bccc48d1d77a8866d45c76e64cadfcec46be86b6a5ba3
font_02_sfnt_off000113f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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