Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd78088d7b076ecb…

MALICIOUS

PDF

82.3 KB Created: 2021-08-25 20:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 128fd1eae7a4d4173d5b64c4bcfea257 SHA-1: e9bca1e8ab2e160a0bc654a4e3cd846f3d37b93a SHA-256: bd78088d7b076ecbe4d750bce9d4f3711deb43590059d2fa5dfc3363fb8e031e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates the document's primary function is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/532d6e497f7ad5f37fd6dec64f250843/93823974696.pdf In PDF document text
    • http://mea-travel.pl/userfiles/file/rariselogib.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160845a27c82ae---datiluzipafamab.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f62c5b984156c66e13246e9f7f12c87e/36954279060.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b17585b7f198c9ea7ee8c699463f365a/zojekadutusunosox.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/28665719104.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/saragovogotol.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/laliwexolimozasukowom.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/lazuxipefopofu.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/sifonawugapefenubabasuj.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c069434cf---52972017953.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/sijefubigowobasedak.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92ef6e93b3---pajifupogiwowulanimelegez.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/dupugelaxi.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/65314297456.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ac3308874010a8f4837fc07ec28e392/xuvifodeb.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11d5a7ff16---jirisixorerikagumemolomir.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe68604ca6---zotejakagunuxoxuzuwak.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/tuxujuzuzaka.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/wuvufotasevojir.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/60230533418.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/89243813548.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/98854960197.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/xivozubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cone+placement+for+maneuverabilityPDF 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_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 10924 bytes
SHA-256: ebb469adb97221bc81d4018253fc61f3519aa16dafb6015d8d452dd2f144ccdd
font_02_sfnt_off00010dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 17636 bytes
SHA-256: 458d97dac8feae7857aa1f5e67731f3c029b574e5a684e6d68b58b2cac9e69db

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