Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cd9358f2cd33dc…

MALICIOUS

PDF

90.5 KB Created: 2021-10-07 09:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9ffb70e9958a38704478ef376075ec87 SHA-1: b8443fa7cdd59416fe2b8b772ea7baa5ecb92697 SHA-256: d9cd9358f2cd33dc84826fcd3a71434c33d5d6cee37480ccc35cd2072c8512ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to PDF files hosted on compromised CMS upload directories. The primary goal appears to be directing users to malicious content hosted on potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://travelsi.ru/ckfinder/userfiles/files/megugorawavulumunok.pdf In PDF document text
    • https://beauti-full.ru/uploads/files/lujutirugitumexobegovuraf.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/21738779773.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/vuwudozijirorujavubupev.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/8086815728.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/69852174802.pdfIn PDF document text
    • https://dm288.com/slicice/file/76442404285.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161511ce5466b8---73577931557.pdfIn PDF document text
    • http://dsraxys.com/uploads/julilunis.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210909_160605.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/zetifijatuwelaxesim.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161505618aab6b---jedojegovuguvuzegazigidus.pdfIn PDF document text
    • https://vos-web.nl/userfiles/file/72776806233.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/96942300347.pdfIn PDF document text
    • http://furniture83.com/upload/files/damegeruduwif.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1fcd2a7f---rirenurezuxebovovoxatudox.pdfIn PDF document text
    • http://status.cz/UserFiles/File/suzukilobagibuzeder.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/94267872980.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/marujinite.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/98320155384.pdfIn PDF document text
    • https://matricula.hssanesteban.cl/files/bonat.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/zodomapisikixakokijofupez.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/4a89fc37d40659e5828dd1ebcdd292c7/78368978048.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/85398416650.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/47056855287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=git+updates+were+rejected+because+the+tip+of+your+current+branch+is+behindPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 11280 bytes
SHA-256: 6529b7b2d32caa8e257e7ed24181d6f8a0b10b4801b313c1490b0c9c155d8517
font_01_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 2012 bytes
SHA-256: 0cb6950f6f7807834f731aca87cf9e80436760de572dcccccfe6f4c0f582ad76
font_02_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 22460 bytes
SHA-256: 7cc209750bfe7cb77884790c3fb2388061be1f1177eb62d39160a18951271c11
font_03_sfnt_off0001424a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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