Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f06a67d64bd80b…

MALICIOUS

PDF

81.0 KB Created: 2021-08-31 06:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 83d3356264ae161a952e44c3f657e74f SHA-1: 5bb0c3e3fa41d293aa9b586c0733632a1f0b156a SHA-256: 19f06a67d64bd80b85d73ffe8f7af52c950c37bd9ec74070abadbf95deea4ac5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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 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 https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/4p04qk8ar9l83rituv70ms154n/81819912090.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c67e66cb7---ragivujivaritupedigox.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/toreme.pdfIn PDF document text
    • http://metabolit.ru/files/file/pivaruduxikoje.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/47448499282.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/97174686651.pdfIn PDF document text
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/90207758729.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/dukesobexabalij.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/waxega.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/95s2u62kjl27mcvnungqvthtj2/tutoz.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/205915340.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe433e6220---89959712737.pdfIn PDF document text
    • http://rentaruedas.com/files/others/wufuxadewaxeruton.pdfIn PDF document text
    • https://stotex.rs/files/tidazusagonesugutu.pdfIn PDF document text
    • https://onlinendttraining.net/files/dawogubokidu.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/mujobif.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c77b6160d6ef9adb02a1d417fa4bcc4f/63899476683.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/tijusolokiv.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/9846124981.pdfIn PDF document text
    • http://bertolinacare.it/file/22197911810.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/rofewuf.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612379c9d92a7---zavuxutapipevab.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/19309589264.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/9327203129.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/87397503827.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/wopebuxuketujitejemifosi.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/ttolhv1qjfhg0gfgre01f562c7/79205191273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=trick+questions+to+ask+with+answersPDF 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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 17536 bytes
SHA-256: c429db7f3aaf1dd63e48a20c99857fa106d5e90a6fb316872e82f5ecf8820396
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 10668 bytes
SHA-256: bdf04e28d78af90b334e5c7f2a330b015bc9adca637fdb26a0559336e07c266f
font_02_sfnt_off00011e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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