Malicious PDF — malware analysis report

Static analysis result for SHA-256 8375e5336a6ccccc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 00:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70e517c636d85b65fa4c5beb085b8dc9 SHA-1: eb8a0c57b98053c65097328e245edcd3c07d44cc SHA-256: 8375e5336a6cccccd67fc8fbc8e2fd724fcabe156ab703fa9709870ed34a4fae
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various disposable hosting sites and a compromised CMS upload, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://form4concrete.ru/pics/cont/file/sukode.pdf In PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/39366468974.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/posizimigarixiwilemu.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/wakedosobikokabaz.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/bogikejijowaziduvi.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/38389780707.pdfIn PDF document text
    • http://philboyd.com/lutetawufozizugogume.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/99079140209.pdfIn PDF document text
    • http://dakmet.pl/upload/42426887329.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/86033355236.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/pozorasuvazudewugotoxevad.pdfIn PDF document text
    • http://panteres.com/files/files/89745100883.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/256047f2b0b1e81284c81e2322892043/zajubabolikebefatozel.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/15373660847.pdfIn PDF document text
    • https://slotpt2.com/contents/files/95788605515.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c67957050---zudebos.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/80394102101.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210913_D2E5B286D7773D8B.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/78725677671.pdfIn PDF document text
    • https://majubesar.com/contents/files/gaweduwusu.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/dagoruwasizig.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/7b17da661708e74488545dadefeb9e51/lirigokafebagogeg.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/50576251328.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/sabopoxuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=amazon+latest+apk+download+for+androidPDF 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_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 17412 bytes
SHA-256: 05c3cd7511ae68e25d6c9aef6ff0c3f7cfe3eb2585f6a74003a3be9cdb9c194b
font_01_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 10876 bytes
SHA-256: 4a6a9db9d7ecbeea48eec7802bb9b195130e0fe600cef3ad1764712db67118c6

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