Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1755b0fe8a12cc1…

MALICIOUS

PDF

86.3 KB Created: 2021-07-14 02:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29fa9da24460f8493c8d7d708ef28a37 SHA-1: ac7ed710498471d3b01321581fd429963909fe77 SHA-256: d1755b0fe8a12cc11f69602a48d2058f6e05e1c686fef60ffe8aeadd542b9b5e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://chrislahoda.ca/userfiles/file/97610524722.pdf In PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/n4kjmuojaa9q258vkotab1m73c/darutijile.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/tozokaporexax.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/ed7d5507716e4d11e36a318163bdf7e0/begodukavarifemizizuperiz.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e27fb06141c---rapona.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8d012c4a---sopeza.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/44d3994e0b8f66ddd9a8bda27620ce3f/97861654577.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/tavobuzila.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c117c787b18---judiza.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9d01a140c---41777232107.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aeac6e91afe---46421760099.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/wisitimovefuwabot.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7029de7bcc0ef0a83d5a62e7d6405791/nuranegenigirasiwokir.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/66862980121.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160968a8bf342b---81648777417.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2989cb5180---kilaxanobifizagiwoni.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/46422268278.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/vm8nvcgjk8bhj0ts4skodetb38/paxetikimonatizonujir.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210520051036.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/6f6dbf16b73daecef82149f0771e1cd4/jukelodokavukizopiz.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160abc64955cf5---lomisefurejeraposapamiti.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/ziwexujuwijazosisuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sky+has+no+limit+meaningPDF 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_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 18220 bytes
SHA-256: a29508e346b82eaca8e5fc1a51349dd70f9e4daf9a6dcf12238454364a61c386
font_01_sfnt_off00011a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A30 10736 bytes
SHA-256: 5dfdef2e070ecc7b6e907cee93867757a313a8eb1fdd0007a5846128e93eab74
font_02_sfnt_off000132b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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