Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c51c9cdc756011e…

MALICIOUS

PDF

98.7 KB Created: 2021-09-10 04:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5b59930b3a078f15149a0fa74e722ab SHA-1: b91f1cd44144db92f31655968a7f1213752f176f SHA-256: 3c51c9cdc756011eafdef5d4e56967bc7abd640f6d7f5465af8600a8be182014
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a likely attempt to distribute malware or conduct phishing. The presence of a visual download button further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=pokemon+team+rocket+edition+rom+hack PDF link annotation
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/janipu.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/54191105217.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/towetofuverapopow.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/51978010774.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffcc0ea4b4---8293027775.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/88365122476.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/felofokukupufajomurizak.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/62436213587.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/70166638322.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/fekukesutibedomuba.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/85107910943.pdfIn PDF document text
    • https://fond.ru/userfiles/file/52112108834.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/79936281274.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/75714150371.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/nekujigiguzimapugotevisu.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/nimupakaxanomizaropanoxa.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/58072123776.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130b258a67bc---30668697790.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/9788757820.pdfIn PDF document text
    • https://bawauang.com/contents/files/ririvudorunosu.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/lutunelojepivisepupaban.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/18051590609.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613997f9a948a---nakavof.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_off00011a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13283 10512 bytes
SHA-256: aeef8f217f285b140505645cf70186be67b21ff1ca60788bbdab888aa777acc2
font_02_sfnt_off00014a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3B 18696 bytes
SHA-256: da0644b6451abde014b8c072bf419477be880750308f5e42b348ab513498822c

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