Malicious PDF — malware analysis report

Static analysis result for SHA-256 d270a7a99499e218…

MALICIOUS

PDF

74.0 KB Created: 2021-09-11 03:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 750781e482f4665f42e3574033092997 SHA-1: d188cda0d732aaca26aa29363220a22ae7074112 SHA-256: d270a7a99499e218f716a4b6b74e6ebdd68686a052f23dc65f9cbe5997fa8312
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing indicate the primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://huntic.ru/uplcv?utm_term=race+2008+full+movie+download+720p+bluray PDF link annotation
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613991c8060cc---pumegajokexexoposaramux.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/11012156901.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/14171755743.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/61703186514.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/dezuraz.pdfIn PDF document text
    • http://telektrans.hu/editor_up/xofemegozela.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/60305998847.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/zosipurozajolisabuwe.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/wujedoparujirusirejegume.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/53089365946.pdfIn PDF document text
    • http://rinsacars.com/files/others/41818479975.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/8835190092.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/75299018349.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/44137927291.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4vsmtc6gsa9fjsobbi73ier863/27707709153.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c9ba62eee---rigogalapesavibibilareb.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ul36vsn2ctn2kjinmc62bnk0a9/japamavunagazukilozezi.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/jejetarimowa.pdfIn PDF document text
    • https://produse-zilan.ro/files/xevebibekoxobebasubudo.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/77579867420.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/deseduvita.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/843a395b6af7c09c364e00014a04f532/82524273831.pdfIn PDF document text
    • http://metabolit.ru/files/file/73500612269.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109100956171346.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/30372626632.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/kerozumegoxenuxanejexi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD175 11568 bytes
SHA-256: 23fac8229a49365a93a19c2a7060cdf1ee931b4b0e2be32ef29ffd24a7064fcf
font_02_sfnt_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 17536 bytes
SHA-256: 859871257e514e0c832dd4c0bd2adeadfdc984b673b61fd3a7c7fbfcfde73957