Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cacb3111221465…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 00:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7f67a08024f8c83a396125245aafc39a SHA-1: 27615bd09a44e36d611459c74333211cbbf64824 SHA-256: e7cacb3111221465136eba668ee25df7414d16dc26077c8aa03561668bf9e9f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161385193494ae---8289248070.pdf In PDF document text
    • http://auburn-properties.com/userfiles/files/8323919032.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b02775b1f580bccf14f81721d7b89068/tapabavozafu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161379c6338933---68526878269.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/turomob.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/duzumituwulomopipemud.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/diborobufu.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/pujusi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/0eb3uep7mdm8s9e1obc647r7j7/junoduwavokiwelizafo.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/toresilosivirokugibigike.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/gofikadebojizorewugu.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/sapuvigeziberotixivi.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/70361284171.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/tukoki.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/99666919759.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4352b52178de6cf9de8968736ad89957/14557553372.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/21675523107.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131b304a469c---jinok.pdfIn PDF document text
    • https://rajaunited.com/contents/files/wunotizavuxofawoge.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/lisibufisa.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/31010210792.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/sazosunukevifun.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/kofugewifewavolofixolelu.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/30444851418.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/winopuwofajubabog.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/gemesugerigizamixuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=inazuma+eleven+go+strikers+2013+english+download+para+androidPDF 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_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 11660 bytes
SHA-256: 6c80b84e0d12768b3eeae4fc6d2d16746f232c02d365549c26224181853a5df7
font_01_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 18468 bytes
SHA-256: 38078594bf189ee35ee15a6fb3b84f78528db11e0133552479e678e951129e4a
font_02_sfnt_off00011f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1