Malicious PDF — malware analysis report

Static analysis result for SHA-256 b238c56b7d01f270…

MALICIOUS

PDF

85.3 KB Created: 2021-07-06 06:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c12e4bf8a1d1c4996b916005a108b981 SHA-1: 19cb29fc06c08e77cba800dae50abf5c4ba70b13 SHA-256: b238c56b7d01f270ef98ba4a89475cf63e3c67c0a51b8fa07c6f574ce269694f
156 Risk Score

Malware Insights

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

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, pointing to multiple compromised WordPress upload directories and disposable hosting sites. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ttgr4ltldt7ugfmv3ofakm7ufi/jeredoka.pdf In PDF document text
    • http://gramercygrand.ru/files/file/89662296324.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/55245706403.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/0otb8ft3d6i8fp4fntp66ufj2d/32442103333.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/darefosolekov.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4bu081u0cuce8qrjohb1aie81r/mikezutemofodop.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/55958500774.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fosam.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071bfaad379e---kakunidoge.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0727cb8f9---beluvomupal.pdfIn PDF document text
    • http://apvn.info/userfiles/file/21062859265.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/12660761672.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/14401009947.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/56623095393.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073f30221be5---85232092671.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e1cb3e91---juxunad.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/62802403593.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5360c2b7---vawoxowipepug.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/49661f3250891ac7ef2bad690fd714a5/19741337080.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdf6391369---62793566802.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/fojajumunikus.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/cfhkualfplda6k1qth0cbu9sgi/71453007943.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/6cc0e98cbc16f9134799353312d389bc/65380550476.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/14137448325.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ab85f795a7b16a53d76f83fe44310961/8107367259.pdfIn PDF document text
    • http://feastupontheword.orgIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ether+12+27PDF 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_off0000ee75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE75 9720 bytes
SHA-256: 664ab9630b7397c5a303b0b5f89a95f0f28bd9ee004f93904239184c60b16e51
font_01_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 16944 bytes
SHA-256: 9acfb7805a6c02d1c7e8c37a97267af29c611a2a0999cbfb87d349336062c7d8
font_02_sfnt_off00013004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1