Malicious PDF — malware analysis report

Static analysis result for SHA-256 309b24cf88aecbc3…

MALICIOUS

PDF

89.4 KB Created: 2021-07-13 15:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6467bf63f74594fac646846a7890305d SHA-1: fe747a5b9594189e4ff08837e78add598f25c0d7 SHA-256: 309b24cf88aecbc383d09638a5712b97c2463ec167d0ad125deca51ec585c4a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely lead to further malicious content or exploits, suggesting a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c874cace42---mesaxagumutilamine.pdf In PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/hpf49dvkhns60eddjf2gfrca07/40420337945.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb8bb874a9---xevenojedokukeregebi.pdfIn PDF document text
    • https://coevent.ru/upload/files/64810050079.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a203d658286---32096985201.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/67178862696.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/789c8fef383edf2b55eb12ae6ec39f98/75247189544.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/d7b4p31vuabmd53fgodmdlkut0/lurodavisoga.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jmsvc3uj24qo1pfnqjgijd2o0e/xenezarogevawava.pdfIn PDF document text
    • https://nevisnews.com/userfiles/rurowatebugevuxejuzipak.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/87702485063.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/sagebibuxalone.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/batetipinozamosokesonod.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/zinikakonudenaziju.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/88898602093.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/lukowebugananekejebone.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d736acbe5f---salezinit.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/96209179254.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/rufuruxakawetajadojixu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/5eb24b91767f4c2d4914c7578dd8e817/87570865592.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/kivinu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d68a019956---32737141480.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lnt3dllklgho3931116ts27tt1/76118256991.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/bejinerakizalosonexis.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e29ae9b7cbdd7ccef5e4b45201279e73/vesemedusatukax.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/solutedibeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=verse+about+darkness+and+lightPDF 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_off0000fa28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 10828 bytes
SHA-256: dda9f2ad293c79e4bb577fa851fb075c4d0ffdf36c0e0af7e20bdd736e18364d
font_02_sfnt_off00012af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 17384 bytes
SHA-256: 90c4da389bf0a5593ceba11533f9e7801b9ee475c88afa30803e6e42d03777b7