Malicious PDF — malware analysis report

Static analysis result for SHA-256 46eff97548d2ab96…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 11:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8072cbe049269b93be4fa0de5b26da79 SHA-1: dc8bd2c4e33a3e451677b853f8d5d064e3b2b748 SHA-256: 46eff97548d2ab96e2f20810c8db4a870ae69745100905189854730384dd46ea
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. The presence of multiple links to potentially malicious content suggests an attempt to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bjbtrh.com/files/pic/file/56165260287.pdf In PDF document text
    • http://textingrights.com/userfiles/files/kebikuwejaputatatej.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/vaboxetemusitebomaloriw.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f01682074e---nugafuradofu.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/zajuf.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096df4b0068f---sidusuwisozolululojizotaf.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/71563413046.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092a8572c3c4---90968378822.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0968a4f6a---rukowed.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/411eae9136e01e47522de326b2b527ca/39048793785.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/gusirezagewenebeveka.pdfIn PDF document text
    • http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/rokasiniwutebiw.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0f60791f0---bixuve.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/42938539979.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/54930513443.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///6126125577.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608879be7dd04---giwikarovakiminoditi.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/eipu8slt5eodep02an351s9660/gixamufimamilitab.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/rodifinusozavinin.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/23613610578.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16098ee1d0f113---48562774966.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c7e48613d---4364675869.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b14b6bc3cc29017ba3e8362c392f76bb/19693745963.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/gugavadidu.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/xogugujoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=queueing+models+pdfPDF 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_off0000ca63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA63 10640 bytes
SHA-256: 32e34153fd160778b2b43ad2faa152e66b388348e2b9f8ad71276be90cead3db
font_01_sfnt_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 17992 bytes
SHA-256: 88bf2f9d31ab7e1bae02c87b75ac57bb1a56f446103483da67942e5f2ed6c010
font_02_sfnt_off00011116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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