Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3c0c30172f9cc6…

MALICIOUS

PDF

90.5 KB Created: 2021-07-07 17:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 966461951b18a4d7161595533179ab60 SHA-1: 583dc68018ef88e29f71c237080857ca2ac9f522 SHA-256: 6d3c0c30172f9cc6463eb18f2a15fb5ce0d6efdf0141abed71329819410afd74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=saving+emails+as+pdf+in+outlook PDF link annotation
    • http://ctkupavna.ru/upload/file/sosamawetebobelefe.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fit1i9ctfrophf5m4p9gkh0bg5/84630481882.pdfIn PDF document text
    • http://mega.kz/media/upload/files/tagopetil.pdfIn PDF document text
    • https://agatanorek.com/files/file/38684396367.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/voxolijovokiwefar.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/pepiloxamomezonivasaf.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5e412e6cce27b9bfb9f4d1a26a28ab1b/rerobizuwaduvimarig.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/sigiliniz.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4a0df508---75519751593.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/puremuz.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c79e377120f7d3ce675de63f04110e28/14360710607.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/26803065363.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609753d080f4a---bapoz.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210507023535634.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/r3582naei4mh3qg8abma3hstgt/47905012333.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/73608688563.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/33038408317.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/cvetrlkpn8dlp5d6cnf7fiur71/93359323009.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/366f3f8dedea1a5c3948d9b4fb3f47ed/magawokan.pdfIn PDF document text
    • http://industra.sk/userfiles/file/71442902782.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/9772869572.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/k3k2mdk7fbq8r1voh38km38qqp/medor.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/22b90dc52a9752de07a5c46c9eef9dc5/62349233959.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/68760870896.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d157550bea00d53cc31ea8cb3694f282/vujogeg.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_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 19712 bytes
SHA-256: 0556e3dcfb256c03ce6e5d2cd376b85e8dc3e66d0c0d002d52a9478d1f78d5aa
font_01_sfnt_off00012ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 11072 bytes
SHA-256: b4406ee85980f17b37ed9e8439a54711c2b2daa7a0120aff7829e8632e525cc2
font_02_sfnt_off00014486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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