Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0b5dfb09b4c665…

MALICIOUS

PDF

93.5 KB Created: 2021-07-30 02:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f674f8bdb63c2be6d8c38fd0123032f SHA-1: 391de521abf85c8480ea121e5546a329838f1049 SHA-256: 8f0b5dfb09b4c66529057b53a2ff6dfd773a5551d7b159c5c3693914614871b7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document's structure as a link farm, combined with the compromised hosting, points towards an effort to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=how+to+apply+josaa+counselling PDF link annotation
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a766aa93bbf0386b70e36551de322ff8/patexuvojusegasuxeresoduk.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4af2054dec---95362939448.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/78609960759.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/3qpgdvjskf92v0dbttqd00iip6/rapubirovadujopu.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/fvlghrp32m1gehlh3pjt8oq2qr/26856875313.pdfIn PDF document text
    • https://htchninc.com/d/files/xefuwanonelezamudif.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca242ec53e---3694693177.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/99248651246.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/wetezevoruwuj.pdfIn PDF document text
    • http://hongdacable.com/d/files/bosogonojabumil.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af118cd167---71709365584.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/zutimanuwuxinaze.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2286c2f6de---59843753990.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/963cd7848db4fd35ead9065ae7a09762/xakapileliwenugi.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-10/20210710082908610542.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/aonk6jdoucin24hlp6pumbpnj6/kosebokiwebizusuvegun.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/wavifefuvoboxitalazuma.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a8d8c365---voraje.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/dosobeze.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qm0qi834j5kithsh4ilidlqhn1/wuxefojetesilepifir.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/tumubiwixikuwa.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/480b63a10a0427370537150b307c7254/43881128786.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/jepufaporomifasufuwa.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_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 17260 bytes
SHA-256: 977022572fbef8ea96311a05d88acd9915e03fa621b1f6a83c394632fbbc1eb5
font_01_sfnt_off00013645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 10872 bytes
SHA-256: 33f5964c491e60b997b6c2e44b1f9cf4d39d9854852242a8b37c50cf44c603ae
font_02_sfnt_off00014f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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