Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d06fb39f7f2789c…

MALICIOUS

PDF

74.6 KB Created: 2021-08-27 23:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e3c5819cc1a063d7871c52d385b9e187 SHA-1: d780812dc055b939679a3d97c0e09e72b8f45cba SHA-256: 8d06fb39f7f2789cf8715dcd07556c58d7a514dce4ab5565d148d744b5405cd8
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://sisparts.pl/zdjecia/fck/file/vebejesavetibigopulejodub.pdf In PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38b65e88d---zafoli.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/75672928867.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bee81bb9a7d---97982218910.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/c2a160749b69adb451b013272edd0fb7/jafok.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/sesusojuzowalowodupadabod.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/29123116339.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/64fb483a93fd4e065e6f580611d8afa5/91257271238.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e08c3a1ee2ce8361752ca13620460d7/42415024526.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/lajusunogewakexivodoromi.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/noribar.pdfIn PDF document text
    • http://halaljones.com/uploads/files/30899818019.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/votevemubirojage.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092f635063fc---nijagexasukonetivax.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/zobakagirusikuw.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/634e7khlmt2s8pihtmo40kkrlr/simiwokivubagutoverarok.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/91132632171.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/44418540012.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/23974852717.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/13734951673.pdfIn PDF document text
    • http://huimao.com/upload/giwobivisatetiwedaliz.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/t2f77ajtiublf009ofmq8otunt/12743839162.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/76711702517.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07bd9f25d6---jikomokepu.pdfIn PDF document text
    • http://schokobrunnen.com/idata/baleduvumanedopunuzabeb.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608798fb829b2---visolaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=metronidazole+for+coughPDF 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_off0000c5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BF 10740 bytes
SHA-256: bd0a7eb4dba01eed702f172d7ab4183df1276de290f667d39e41f9e778fcaae9
font_01_sfnt_off0000de29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 15008 bytes
SHA-256: 1a184f252de806591738bc5bfdddddfe20d81112c11494dc4f2d7a17f1ff5efb
font_02_sfnt_off000103c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1