Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bc677f26dd719f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-15 21:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2cc4f49289a795925db3fb27cb4e5f1d SHA-1: ae2163c22f8ed9ca7917e6c43a3dacc4c6290d34 SHA-256: 68bc677f26dd719f93bcdf45d7fa266b58008977e94f8559e6f3f578f325ff24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious websites. Heuristics indicate these links are hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crewmak.ru/uplcv?utm_term=best+defense+training+weapon+osrs PDF link annotation
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/34452700778.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/sotatulejezi.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/dagizelijezitakoxe.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/3194138087.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/86845387631.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391d6257aec---gusipijene.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/63447790439.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161421e9767436---72453240971.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/xofulimowunugifazagiku.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/bowivovukosojozubofuwuso.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7fc03f591---69797772480.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/digorozewibefofeg.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/1255113828.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210909/file/13319340485.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161320d9092271---94980399968.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210903222310.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/15200830762.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/koribobewejivuzetokud.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/67496958530.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/82475641704.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_off0000d133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 17136 bytes
SHA-256: 8859775e8586f542346dfb0740ec7c96bd961c20e9a7b42e1e7965d5b7a07e9b
font_02_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 10768 bytes
SHA-256: e5159b0109e7da6eca9651f439829493dd5d756ffcc900c527e586f1fb127516