Malicious PDF — malware analysis report

Static analysis result for SHA-256 538762850fb5d6ab…

MALICIOUS

PDF

113.2 KB Created: 2021-09-01 13:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d40ae874b0a03fc48c54ae759d065ae SHA-1: 7a2c4b4609a3e71a0d12ca1ae2f7c82a26a3b8ed SHA-256: 538762850fb5d6abae354093be34783ad75c4a00c676d119486304cd060404d6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091aa100aceb---rudaz.pdf In PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd5d89fe7a---79738881959.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/24700351366.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/82112995762.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/1c04f0e4cc0593cb7823725872c56914/73030077084.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/7e3812f93edb83cd0c93b14741a4effa/47657191240.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/munarupitovobi.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/73871310374.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161091aa6bf757---13403740772.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/olh4n5bgqqjdtvia6fsq2bjhd4/39917888721.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/nadeterapope.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210809_042024.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/gafositoz.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0411d31b11---97430281292.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/5d33e962ddc6bb784a6478d5528944f2/27726397609.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add212df16a---tixolewoxevenudikereruwo.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/81543897115.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/61733747119.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/75467161631.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/zojuwiniwapokipi.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610444f385ec1---74164165247.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d5a07979---66014324583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+do+forensic+psychologists+doPDF 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_off000155f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F4 18364 bytes
SHA-256: 2956f87fc3e6c0f450f715e3a9d6dc3c71ba8ab7ad0a26d0f30b83a58b306377
font_01_sfnt_off000185e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DFC 11004 bytes
SHA-256: 0f0c7f3a7a66cc7f65e41876ff708c28ecdcbc3701f43e0da63d2ece124777c2

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