Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ede51c3b7c9e29…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 20:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 787cb9a2a9e87833159f61b320d48d9b SHA-1: bb3d457b1b31db15605cd2342363667df8d0d59c SHA-256: c9ede51c3b7c9e29b5ccec461b3fc4809d6550b1cc83b73af645b23359c2e961
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content or phish for information. No scripts were extracted, but the presence of multiple external links points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/63269845c1580c42faa3f7f1f03a91b3/wexaweti.pdf In PDF document text
    • http://www.thaiboat.net/image/upload/File/57391881852.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bc05mgrhdp9ntsq2mp2s8qard4/wesitiriwezef.pdfIn PDF document text
    • http://oodow.cn/upload/file/210727213623774914hyll0tpo96s9.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894b343f7bc.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9aacd2983---95072014143.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/857508f64f21ec9ab58633eaab0de8dd/najesotivinomim.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/37677536984.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/28608309702.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fg4mfm2embgtsh3r2jbhmicbu3/42678560957.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/nesilawasakujexipugi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e238947fc---6395329461.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16111b3d8f0b0a---25395337390.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/98543182757.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2e062b513697e5d74e2f32562df0f0f3/595349031.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/61459783865.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/zudenapovugewuxakifega.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/sc28hde3l36sqal53ej612rfuk/53801091481.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/fegopepavenadomelep.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608849b06f0cd---75692952367.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/nogarosukoxi.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/85342150498.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/zogurejusitebirulago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=robert%E2%80%99s+rules+of+order+newly+revised+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_off0000d77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77E 10932 bytes
SHA-256: 62531038e7d6d256a56a184ca461e1cbdf9e491acda4e1c37fb4e5dee9ac1615
font_01_sfnt_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 18408 bytes
SHA-256: ad1a85e4e56a35980321c2c14ddeec6df25bef9c139676295fb87e17481869e2

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