Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73ce17ce2133ce1…

MALICIOUS

PDF

93.2 KB Created: 2021-07-26 01:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 484fbde977d3e312a7ab2ef71494462e SHA-1: a2dc39827c52e7ccd274d81a044f4c011a655d35 SHA-256: f73ce17ce2133ce1944bb472d8f6f98d9523f9605e1dc19de4aeb0ac877532ab
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to direct users to potentially malicious external content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/f9e1u89ddsqj938qmc7ctkr77b/pikeretalataloredexule.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607a260551637---nuvugixemekisoze.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/wibazulut.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/lasonexuwemoxamepot.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/2354176900.pdfIn PDF document text
    • https://lecachet.fr/docs/files/dodejigiwufuvafaketir.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fdd99fea8551136689aa8b8bdf196f8c/jifefitogarim.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/jupeguretumiten.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608650826d765---71846018304.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210625041347_1ektmk.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/87231389508.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d00d8c5fe93d4160493b0da1c878ae45/karekigidonaribibezik.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098d0f19bbb9---32245463274.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899714aafcf---kiminosoruruvegajotoribal.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077ba81d253f---72745776685.pdfIn PDF document text
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/tizotopunagigujegemofax.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a68d9f083b8---3944749921.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/47093411510.pdfIn PDF document text
    • http://voijin.com/userfiles/files/gosibabo.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74233651506.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608d49cf6713c---11317716119.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/lisukisola.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/86837491382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tiempos+verbales+pasado+presente+y+futuro+actividadesPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ad05c189fb81b78b06c631dcd7b8a447/86370674247.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/707d4a16abeaf7e404105271845d0d15/zevosi.pdfIn PDF document text
    • 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
font_00_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 11164 bytes
SHA-256: 6253582b24a00d84f97855fffa14463f6a901c0e1cad744d432d2b0159f6870c
font_02_sfnt_off0001289f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289F 19136 bytes
SHA-256: 696dff1d6d450defbdd3b81aa03a319c3f36c4e40e6362988019da27c5934e70
font_03_sfnt_off00015a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A0E 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832

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