Malicious PDF — malware analysis report

Static analysis result for SHA-256 911b6da6c77330df…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 03:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a219dca0b0415b86f5570aa1c09a20e SHA-1: 9ef554df6a05e4278d9b1af7d2fc3eb59596a4e6 SHA-256: 911b6da6c77330dfc183a260d14bb02a2f10338ed3900f6c4aa880630a13a7b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to direct users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wastran.ru/uplcv?utm_term=cabbage+family+vegetables
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e1869e627d09bc8c3b982ca58476f31d/wabozaturararexo.pdf
    • http://allamericannursing.com/userfiles/file/27122031824.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f58107ba93---15640734496.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b499cd2addc---57398522117.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc22d74bc---xilivonupekanibuwobem.pdf
    • http://dgjst.com/upfile/file/wetowirizasa.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5512e1eb---14812124541.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d6f73867ca4eaea78718f1a463706733/xonisoxewimo.pdf
    • https://amitadevnani.com/userfiles/file/lejaduv.pdf
    • http://parzenica-bialka.pl/userfiles/files/lesuj.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160709580b456b---11864571171.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a33fe530601---magoda.pdf
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/tunobevo.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c9637209bd43e36af983d6d49e355f15/kenibomoz.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b477a40f17---timezopoderojimudavoxeb.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f8622407---podujuxevativodexa.pdf
    • http://hyundaihungthinh.com/uploads/images/files/19150288894.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8ba572cd2b15d1c99787ea9687b78f38/lodevasesenejojir.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/24a8aea7bb30acebc2b859bc0ddcfc36/jabanuxerokajotewike.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/75020675205.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/4221576633.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4ea28cfc---95433690573.pdf
    • https://tes-sys.com/uploads/ckfinder/files/20210629/16249221549706.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec61.bin
768bb5b569193df584646ccb4dd1c5c3793624881fdccbe3e56020b319f6bdb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 10584 bytes
font_01_sfnt_off0001049f.bin
a882a5a0a290a8b5bf3e5e7e8956e873e7dea57d3ec43dc934c9f8c26ae0ccfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1049F 17468 bytes
font_02_sfnt_off00013221.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13221 16792 bytes