Malicious PDF — malware analysis report

Static analysis result for SHA-256 2700861492cb83d4…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 15:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a272975fe53e4d4fa4e8be3e8ce52a34 SHA-1: 71671576d9ba53a3b62ca9ec7f08a311c6248d51 SHA-256: 2700861492cb83d46a3c3c93e84e6394a84907781890ac85fda59b003119550f
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate it's a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/29c389c77580b16d73c2885e5147a309/sigetudepalena.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/aaa35ff3e7f0a3e305f234782189819a/61018080996.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///37145189045.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/33ac0351079aee9cf872360f6cac1922/63206579986.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/fesagurugetowi.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/pesujiramajinorurivoxibuz.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/78332998639.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/38241716082.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160792d9c35628---nonef.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608f83c0185d2---11329588999.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/pinaxuwazotexumuteninu.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/jirotozufesakivede.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160953bcf610ed---33974013198.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/bb48df87a4c662ca9e1bcb6c077088c5/fesukofiruvenuzozuv.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/xejixe.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/renixalarinevimamovedetab.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/15473485930.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/7r2g3n1g9a1psbv9iaflkvmf73/paduvafuvi.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/xijazefisip.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/69544308316.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607429962543b---96735306673.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7e318c602---xujuroxagovisokulaf.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/wazupabe.pdfIn PDF document text
    • https://daismene.it/file/56594194499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=syngenta+logo+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_off0000bfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE8 15828 bytes
SHA-256: 7d8089f241155faadb7d2b2628a37b6e8a9a037510536eb0bed830067775bd06
font_01_sfnt_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 10504 bytes
SHA-256: c7ebf2928da6d8ac619f91ef686919bf3e6858c67bfef1362416725f598bcbdc
font_02_sfnt_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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