Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a58c76ca749e22…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 12:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abed6b7fb5832246db3ecd8a8254fb89 SHA-1: 316d96ae0fa50961baa700abfc3e6ddb17ee0531 SHA-256: d6a58c76ca749e22ab0b99ff47cf1eefd7ebc333e8959bb6b244d7edfaf5122a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=free+premium+vpn+mod+apk PDF link annotation
    • http://hoteldanang.com/uploads/images/files/kefabu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec757eb2e2---34577940932.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/88813869252.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/77870401152.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/t25abcric9j017o5628h7irpg0/japinexezosijezekubodetop.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136d70603462---63752781036.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/16309386360.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132394627597---90764284057.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/46068896401.pdfIn PDF document text
    • http://ndt-ultratech.com/files/2166462764.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/dedivuterekumes.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/sasonunuxesum.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/83155084906.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/51546101556.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/2821757193.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/91029904367.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/42312646904.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210906135408892178wdxib1.pdfIn PDF document text
    • https://petikdaun.com/contents/files/gogunisepipozoxopofuli.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/xemizakigumesezu.pdfIn PDF document text
    • http://dnepropress.net/files/file/fobepar.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/artcano0jrvik33ai63gdmdfnq/tateroxedusudujanetew.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109082145064875.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_off0000bd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2D 17248 bytes
SHA-256: 9d82b249453ec0e38b3ee2654e70b54eea15bf93d33de006991e017d2c1844b7
font_01_sfnt_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 10476 bytes
SHA-256: 7ec7652ca3c417bd48c4418805cd6f5d2b6d360c20f76c1b6b9888f8672cc87c

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