Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffffa9c93177c91a…

MALICIOUS

PDF

93.3 KB Created: 2021-07-22 07:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3aacc7b7a84f46e1c0513eec8dfda0d0 SHA-1: 7de66000e93c5a669ec5d02f5ba2a92fe68c5957 SHA-256: ffffa9c93177c91aa23dd01eaab34047517a4126ac571eee47af74e8c2bfeaeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.ojchamber.com/ckfinder/userfiles/files/79559160321.pdf In PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4a1994a8d2bbb6b619638ff227c22146/lekexojupikag.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/diwiv.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/jokikujegifanaxilolok.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/ganub.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/21971396906.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/kigogoru.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/6f288578218f98e38e61914bd7e3266d/66568454887.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/8657942839.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/41351790318.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7c73d1915---fefagexezaduxuxopag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3665352c3---30998580871.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/36668046125.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/73lvaditnvulq5r2j7vuphaf93/2999610419.pdfIn PDF document text
    • https://aokman-drive.com/d/files/kixafunawobusizitetewe.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/denagesezisituzunag.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/82028846513.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5fdb8db08c4c0709b8034d3cc349e3a7/91088350636.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e65c6c82---98083178516.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987afe8ebd1---jerub.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/sejije.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/wupepetonisemilevujozeg.pdfIn PDF document text
    • http://change4best.ru/upload/file/32257723649.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/13276361589.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/salujuv.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/p3kk14vadvtvoht4unfot5r5tl/gupakaxobidudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=peanut+butter+and+jelly+muffinsPDF 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_off00010822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 17400 bytes
SHA-256: 479b087a8ac68589fdb07f87a0603962431076b17fef0dc31704387987a1d415
font_01_sfnt_off0001359e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359E 10880 bytes
SHA-256: 7381cee6b934b0f7a3ac14eeb290f0b126163c1928f4cd2202441a9ab0a4bb73
font_02_sfnt_off00014eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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