Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3bad6487371a25…

MALICIOUS

PDF

89.7 KB Created: 2021-08-13 20:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8b0349035f73dc25155fce2a4e500fa4 SHA-1: 1d185048f36a3792d95be27e567470d61516428a SHA-256: 9c3bad6487371a25fd28fb80eeb32ce3a471ed9f0bc9ab7efbefbb5eb5ba9ca6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute phishing content or second-stage malware. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://drafthe.ru/uplcv?utm_term=libro+de+matematicas+quinto+grado+2019+a+2020+pdf PDF link annotation
    • http://saltyfeelings.com/userfiles/file/fidivilunitumajiluriw.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/67239818060.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2e7c17445478e00cd2d91e163d229ca8/92405512336.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/f05m848i3c3d949tc8m6jc1427/leligutasiribijamesikuk.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/12617472434.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/q4hmh2dh7ec0gr6hlb0htvn9d4/bubazenod.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ae5097b914fe0ef2e7240eec1d265600/mifupe.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/pinapevenix.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/lonajasimibomuroguxomixo.pdfIn PDF document text
    • http://jkohut.pl/file/29696671122.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/88124199379.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c75ae1557bb---8717428611.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/debifekife.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/24f95f26f361a0d7e106df93d06f8527/poruduper.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/bomudixoxin.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2099ad3e7a90a148a479b45ab5b32515/zixibatarot.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b521f17ba3---dubunimoxumenuvabukit.pdfIn PDF document text
    • http://labonscafe.com/userfiles/70513363198.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff17da959d---javoxujekabagi.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/80073661060.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/vavededuzitelewamuva.pdfIn PDF document text
    • 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_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 11724 bytes
SHA-256: 1a356473049bd335c78c87016c783804e223dc848545800d4760d49e9897ad95
font_01_sfnt_off00011074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11074 17984 bytes
SHA-256: fb37b3dbd6b59ef9d24919b60d33f1176e9d17243041a1535a53b1f54b12aac4
font_02_sfnt_off00013e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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