Malicious PDF — malware analysis report

Static analysis result for SHA-256 409f97234594d2b0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-05 07:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8dd985dc7c8b18b99338749455b45b77 SHA-1: 92494cfdd517cfb84331b10f279b1c39fbf01515 SHA-256: 409f97234594d2b02c2ef5e4d3803bcf97d7be6e45391b9c2fbbe35df6673dc8
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier further support its malicious nature. The primary function appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 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://lineshare.net/upload/files/20210623102351.pdf In PDF document text
    • http://cybernet.asia/UserFiles/File/fojizipatelexoneketezi.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/95892755160.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/jiwuribosimopexexenoweb.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/26958815010.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8174151dc---jitokukoveloran.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0868c2716fbe91109940263a09986599/64985107201.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/mirajigovaratif.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/42346427081.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/11315109792.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/bepilenixusejedufon.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/zared.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/a11a48cea134c2a6044da125016f1436/82171655899.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecabbc15a85---xokerisuxinafukujixebuxos.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/mibovugonanelar.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/drfgbq9dpvs3b7g0pc0gvp6nno/debasoputakeduvata.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/21217904957.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/pelemalidodepikujanaf.pdfIn PDF document text
    • https://stotex.rs/files/ragatojunokotawup.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/31614775213.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/19824216859.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/78f3efa5d903929d82c8e496d7a078ac/34352541308.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17244938461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+create+a+website+with+notepad+pdfPDF 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_off0000e0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 19052 bytes
SHA-256: 4f2ff8ec405dceeb4a94b6b8e621f0647f96fec58ccb1dd3811e002fcadcc0f0
font_01_sfnt_off00011301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 10888 bytes
SHA-256: 8f41e7d415a55fefd8a3c0f5348ba87bf1f2be73be683088f08127edef1083a0
font_02_sfnt_off00012bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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