Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2de00c86c834102…

MALICIOUS

PDF

80.3 KB Created: 2021-08-29 23:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 22ed6b7fde1a280c9729fd7f1cc346c2 SHA-1: 03ae053224c5df64d0e25410b9fbeed76f8bfaa5 SHA-256: a2de00c86c834102b1dea5a0385a927cec59dfbc3da08da8596e34a75e4f0f42
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 0.9934

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 http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/42n49j4hnltg6alfoad6hdhjrv/3559871434.pdf In PDF document text
    • http://arunimaflavours.com/userfiles/file/kejiviberubivuzus.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/80296632741.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021072510560870554.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/webifarane.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8ugdn0g563rv1ehl5l9g89aik3/xizeduwezopunugeda.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c4bca176---67282120710.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/80775893834.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/30649516214.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/899c858f292e6831eb7baabf07807bf1/farififopezunexononixanot.pdfIn PDF document text
    • http://fitviewer.biz/files/file/98088613592.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/97229577156.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1e04bc1ec---89052255016.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/64829354385.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9b6e2332a35603296842ead6131b784c/wezik.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/56232285307.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/8724797104.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/7e5dcd93d0b9d78b28d07c106abf6d23/70894898414.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/zurewadisafurewopidani.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/jufasiko.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/753411124.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/61364753219.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/pafatarinabudapipimilowe.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/zuzunisebixenikomigufufog.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/larumo.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/sajugako.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/xipegadapor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+supercomputer+in+the+world+2020PDF 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_off0000d48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 11100 bytes
SHA-256: a5fa666af6641991b648eec955103c8b956ffa910bf6169405af8a6592801e63
font_01_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 17228 bytes
SHA-256: 615bc92f8eee731f9e493f24a2f1c056ed558beb11e1a1cf46b6d0ef715dd5fe
font_02_sfnt_off00011b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1