Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfbcfd8557f218d…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 13:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd898981d4ea0dadf95b966bbb5e6040 SHA-1: cb5de82cfc1035ee54549430d33d5139ded4e0ab SHA-256: bdfbcfd8557f218df399e4c57fe9535452820ebe484b17659d7a80001b43004e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains a link farm pointing to various domains, some of which appear to be compromised CMS uploads, suggesting a phishing or malware distribution lure. The presence of numerous unknown URLs indicates potential redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mamadona.ru/ckfinder/userfiles/files/ripator.pdf In PDF document text
    • http://aaaexpressheating.com/userfiles/file/34109038431.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/f67dvd6ppjhbpsgm7qim6lfer6/81187602314.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/52144717448.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/pexozeb.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160bdab4f3a297---69022866155.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/51392451052.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/ribudavanuret.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c03cea56750---27114837597.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/gupimuw.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d613492fdf1---bozotavawozuzamifil.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/zikeja.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96ef86aba---pegukewiwa.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/mopujobix.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5b5e1ec24e339c2e474f0313413f169b/54078563999.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/fowopazerogodawisegis.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/b649d2763c2d3c197aab6a84a6c9fda1/69831022686.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/rerigadoguleliwofigowa.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/77079979353.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f76d0494be---tunafogilemunarelubomemu.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/gikedusef.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/4epllp4u133n94vo1j1o00sfqi/paxewawekalujuwaxexirexi.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/3qhcp1e8aa97jiubbg066ogi9o/sumizegotopobefekipav.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/21f51b454540f1618f792adf32c0025f/bazerefidu.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/busajefirinofonuzamiluj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=los+53+sutras+de+buda+libro+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_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 10892 bytes
SHA-256: 83c7d35f51db1a4c5bdbde37c8e6d1648e6f8339d82d637a9612d3a18ddad102
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 20260 bytes
SHA-256: 0a9885e22eb1d50c1b5246ceec575e4e29073a562a15ccf2081a0168f9ea03ea

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