Malicious PDF — malware analysis report

Static analysis result for SHA-256 97904a6c75597c6d…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 10:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 503ea72e3d228034a62ccb7194281f13 SHA-1: 2092ea1ec351ceae5b44282c2de608491f8d1969 SHA-256: 97904a6c75597c6d03ee14a959068b687d51d37d7af01d286140313c01f3711d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://cructi.ru/uplcv?utm_term=pokemon+yellow+emulator+download PDF link annotation
    • http://valdhans.cz/userfiles/file/18293444661.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/sevunubetisinirezujisezas.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/bepafaxovirixazez.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/pesojev.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/21076300435.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93574145797.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/mawuvaxelesure.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/7020826140.pdfIn PDF document text
    • https://zzwgjx.com/d/files/dipirupasosilagukeluluto.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/xolixowisejuves.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135c3669208d---mijebakodajuzenigopeba.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/418338d92ec69bcf498aa62c67ec3173/gofojolikorupoje.pdfIn PDF document text
    • https://kiptep.ru/file/48101838126.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/46480866363.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/wobusizudemofiripel.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3f0f4a966---72403039981.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/zazupeligu.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/29649762399.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/92314608856.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/vivonisapumifiwo.pdfIn PDF document text
    • https://inarsindbari.org/uploads/saxevopoda.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/10136266668.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/34015668473.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/60571459554.pdfIn PDF document text
    • http://sns.hu/_user/file/repuxaxesazofavizinisa.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://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_off0000b2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B5 16728 bytes
SHA-256: 2ca3312d1b5d6b8c7e33fc6b7fbdecb2511ad5fa5e8f96e353f6195ed33967d1
font_01_sfnt_off0000dc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC28 10544 bytes
SHA-256: 91c0c38d1d4e896e78a822bb24be2988566d4d4e8773121058bbde336d274d61
font_02_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1