Malicious PDF — malware analysis report

Static analysis result for SHA-256 1249393eb38a144f…

MALICIOUS

PDF

109.3 KB Created: 2021-07-02 04:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1cec662ab532a49b8c9f25f9d3bbfb79 SHA-1: 4f6f00ee878a888ba9befddb71b1c98c0e41a3a9 SHA-256: 1249393eb38a144fc7c3ccd73275ef617409fbd8bef2d068a6ca887b8a20bc92
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 phishing or trojan threat. It functions as a link farm, distributing numerous URLs hosted on compromised CMS uploads and disposable domains, likely to lure victims to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c948aa2da5---4203005028.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609065db1498e---pevibudosapu.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/18560976557.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021631737523839.pdfIn PDF document text
    • https://papiratisk.cz/soubory/50516783997.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/97676080732.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8ff07f3a---tatujelem.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d46995025---86673172117.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/ginuwi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc95e30b0ac---pupefonusovulesif.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/kifevusapude.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/10439604956.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/848npm42eurks53vhm7no47oh3/jovekutakolu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701eb5ac9b1---27258632539.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb3a3f703---vubavuvixujozurika.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/tesobokesudigisezaluja.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/tesupam.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/67970103977.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff7df06f7c---11599123844.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/0830db919cdeb51ee04ccf010fa3ac31/nazurogenijipasokasewel.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6d13e04a272cd4337462058116011f65/59331671075.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/toboxov.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacb2c3c16b---28652953462.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/rabovesimetubojuluwawivir.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdab44f1869---suxifepokezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=which+mughal+emperorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017cb6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17CB6 24148 bytes
SHA-256: 4fc57787c07642c982323ad3a5247d87e68cc0611cdc252c51ce421897707bf2
font_00_sfnt_off00011f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F36 17484 bytes
SHA-256: 332c008a3e27b7b0022166e6a856d5c23c130c2eee6e5ff3a25af666b45af223
font_01_sfnt_off00014caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAA 10544 bytes
SHA-256: 3ab6bf66a32e1b219d3df095066a868ff8f61e31afea0b7c96585ece7035bece
font_02_sfnt_off000164a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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