Malicious PDF — malware analysis report

Static analysis result for SHA-256 c189b19ad5f244e3…

MALICIOUS

PDF

86.7 KB Created: 2021-07-01 00:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4154fed3827cfa2c5b264c76c1525d8 SHA-1: d5cd967bfce62a35dd9dcc4b9427984d6ea9bf59 SHA-256: c189b19ad5f244e3282fd11eb7a554d7514af976fea1c1ea2dc50e577fa10ebf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised WordPress upload directories and other disposable hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites for malicious purposes, likely to distribute further payloads or conduct phishing attacks. No scripts were extracted, but the overall structure suggests an attempt to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://catamma.ru/uplcv?utm_term=cannot+find+ip+address+wifi
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23591dc949---61203983502.pdf
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/rorexunipomujal.pdf
    • http://alituncer.com/userfiles/file/zidofilatajagosatetupa.pdf
    • http://asbazainville.org/userfiles/file/pijoramabonibonalugibar.pdf
    • https://666666.vn/upload/fck/file/33670339378.pdf
    • https://triangle-electronics.com/assets/userfiles/file/67009332319.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/f1d2lon5bb4bp6ttru00qogk4a/28130491672.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f972e393---jibinigofifevelanosenep.pdf
    • http://metabolit-plus.ru/files/file/parorejuxeda.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607991be7d78a---71039855026.pdf
    • http://jingchengs.com/jingchengs/ckfinder/files/20210618195017.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7cc85475dd139b47839f6b68620bc3c2/rujumaxidudamaxukazajego.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4ab57bb76---88621949139.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa589fa41---loneroromavelogak.pdf
    • http://strandedtattoo.net/file/xidabojegomumemunor.pdf
    • http://alnadaoil.com/userfiles/file/sofafo.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/m8fkq68crdbnihtl7mvhqm6ui7/6914687563.pdf
    • http://mstreatmentadvances.com/userfiles/files/7338797504.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/002e0dc46c829d1429785363ec0729a3/xuvokalus.pdf
    • http://brilsports.ro/userfiles/file///55982030622.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6819b169d---sugakilibegukobalosa.pdf
    • http://5m-tti.com/uploads/image/files/65085653163.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a559fb133d7---63876175148.pdf
    • https://synodradomski.pl/userfiles/file/joxubisuvonujaf.pdf
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/26060117789.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0180e3b57660eaab467eb4095ba89f82/33215579936.pdf
    • http://allasclub.com/campannas/file/zexisinoxux.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_off0000f2c2.bin
3f49ca15bdfd22e4450b9c73b8c1102afce03a3804da7c9237d2d5fd99230bd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 16360 bytes
font_01_sfnt_off00011cf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 16792 bytes
font_02_sfnt_off00013509.bin
bf16ed23d88b28495e1d3e5c66c25833e2e6c691658952b808431d65cc6600a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13509 10560 bytes