Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fec5634770dcb35…

MALICIOUS

PDF

84.4 KB Created: 2021-06-29 03:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb881b196669d8f69d7944119f296213 SHA-1: d8da4d30a86b2c611a6a4544ca1060d7269f1f54 SHA-256: 7fec5634770dcb358ba04bc130ba6a295305680e190d44f341e1657f805df4e7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=how+to+get+paint+pen+off+of+plastic
    • http://agiusfuneraldirectors.com/files/file/zozakaz.pdf
    • http://moreit.ch/productinfo/file/39087087332.pdf
    • https://akapacha.com/userfiles/file/56168493665.pdf
    • https://mfdesign.hu/files/file/pozob.pdf
    • http://azizolace.cz/images/file/vivevezixixibeleleli.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0087dca70---wovedetilaziridujujap.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/4c1o3t0782cfs2dtnli6uofm4t/91181810494.pdf
    • http://meble-tk.pl/userfiles/file/biguvowufezegexopi.pdf
    • https://midasspa.com/ckfinder/userfiles/files/47215207671.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075119eddf9f---78329316215.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qfb5ana7k7sji5e8lg8t8anul4/rizobumeguxulir.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8526b1a588---romejumisavebute.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/sewofavufiv.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/oa34aphg7jg2hh59g2jul6sjti/liligotokejivififutise.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b050532531e---82842676508.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7c6135c594aa24062188c07bfd54ca3a/jopazofatakekiw.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/bf3dbf882405cc226d4901517b731c9d/fovugafaluz.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc321d1b87c---bikutudosofudawojeta.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b92017db20---livedivejaxi.pdf
    • http://creptiles.dk/userfiles/file/zunidikuxib.pdf
    • http://centrumbiznesurawicz.pl/userfiles/file/17832512135.pdf
    • http://irodori.kir.jp/files/file/gudejogiderinokovafufinaw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 16792 bytes
font_01_sfnt_off0000ff66.bin
771a6174c095234cadaa5e53c301345a1d2f05b1a81e4412449f291739fba8d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 10632 bytes
font_02_sfnt_off000117ee.bin
db93d0e69e903f7e813affd876c9d76b26a1d2eba7353a5c76407b34596041c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x117EE 17052 bytes