Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45ec1244a334cdb…

MALICIOUS

PDF

90.1 KB Created: 2021-08-08 15:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65d4db797e8ce9f340274c7219443b00 SHA-1: 28f0de87021f637605a77bbb0220ccf4a3bf1ba5 SHA-256: d45ec1244a334cdb3228c001b4354cb25ec547bd45d64b4eb946121892a546fd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The high-severity heuristic 'PDF_RANDOM_URL_LINK' and the ML classifier output strongly indicate malicious intent. The primary function appears to be redirecting users to potentially malicious content hosted on these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://dvg.asia/ckfinder/uploadfiles/files/gusajivavowugak.pdf In PDF document text
    • http://didula.com/img/file/29180475245.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c4edd9de81988839f4454734d9e4cff5/79127769954.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/1hlkha1st0mfkbed8auieh5g67/41896936693.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee79c1bd9a0---vepuxe.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/78091693535.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3094b588e---madesisedadetobofobi.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/vavalabodabuwefemewu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/15370612887.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/024dbc9eca68da9823a69bf0dee7f62d/xinabupof.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/retazugajom.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/56583487418.pdfIn PDF document text
    • http://landia-print.com/pdir/file/42822981763.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/dakosutuvitufawagar.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/ginopipemudikirebosu.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/zafudewotanobi.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/xisazitaxexolipak.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/63679877191.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/69650990874.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160da9b5c738c3---63907550885.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160853d1e5f840---ramibol.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/fekazovidapolagarigovax.pdfIn PDF document text
    • https://soechi.com/userfiles/file/rutadoxi.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mazabowu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2k2bhj1gleqfi0mp9pjh0vkqg3/18250584918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+you+install+an+ice+maker+linePDF 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_off0000fa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 10912 bytes
SHA-256: 0d81b9556d7435f2cecd97417fa16503d71bc7c67b8c4b01220b134786fe05cc
font_02_sfnt_off00012b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9D 17456 bytes
SHA-256: 1c6e4c3563ab16748eb7b7d274fee868d5d0c014a58c229e514085ce54cbd04a

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