Malicious PDF — malware analysis report

Static analysis result for SHA-256 638fa139102d1037…

MALICIOUS

PDF

72.9 KB Created: 2021-09-27 00:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01d6792f4840f06fe4d0f3138d4613f6 SHA-1: efe1988e88f7d053a6bbb6af03ea9d38e90785d3 SHA-256: 638fa139102d1037271d9c24191a3443524ee6462cc07df4a60927bf59ddd3f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The presence of external URIs and the nature of the heuristics strongly suggest a phishing or redirection attack, likely intended to lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=how+do+you+share+your+location+on+android PDF link annotation
    • http://getrade.net/uploadfiles/file/dubarisejawozevir.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/wamagu.pdfIn PDF document text
    • http://chinalabware.es/d/files/xufades.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/kumizitobasedunedewitu.pdfIn PDF document text
    • http://timebymtm.com/upload/files/xibexa.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/wunivod.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/kaketozavi.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ff709f9b23adfb97d2ce7eaec4b0badd/bikitawogevitafuxemurop.pdfIn PDF document text
    • https://cardolf.ro/files/21687078614.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/58466853257.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/lofofolofudomitexixomi.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210917184950222554y0pll.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/96570170880.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/38148860103.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/lewudifo.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/2519859709.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140c98981c2b---zilifekobuni.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/gipefakewubasu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/rphdsebp745s83nq2achir920e/xulidinulixenixumepudur.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/jujisopifa.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/kolamopajizumoropil.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/54272297526.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c2c8dcdb7---83958987744.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_off0000b663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB663 10760 bytes
SHA-256: 0b87d06746902db051412455ef990a9f1d089075f3146dc897aad778a8948943
font_01_sfnt_off0000cf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF18 18100 bytes
SHA-256: d25a61efb0bf351081b3bffc4675755a0cb8b919040d1ff57dde9ca55b21f214
font_02_sfnt_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1