Malicious PDF — malware analysis report

Static analysis result for SHA-256 031b650df03693c0…

MALICIOUS

PDF

84.4 KB Created: 2021-08-14 18:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 986c12de07cde38d92543b37b051566d SHA-1: 0d71e1a1b8a2785d93d554fff738d0b91be718dd SHA-256: 031b650df03693c088fe400f4be3f6162951e74ef50c70100f81ff76912abd0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The presence of external URIs and link farm characteristics suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=how+do+you+connect+internet+to+dish+network PDF link annotation
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5fa668943---18531394851.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/377c1c82223084bcdc97e7542029d748/sanebojel.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/18254854283.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/kowibisigujotawefazexovu.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/85720015628.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/benonokitab.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/69191780292.pdfIn PDF document text
    • http://toonesk.com/upload/14512917514.pdfIn PDF document text
    • http://mopron.ru/upload/files/jenetetonenipori.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a5fbd766a---11772380895.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kovogetivinijo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c63308eda32---guzetasaxetuvomaxamari.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1d4bc0e10---24803739555.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/vorixefowew.pdfIn PDF document text
    • https://egca.fr/userfiles/file/48112057284.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/84882236848.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/juretepa.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/lolavisomoxepodikupebex.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/akubph9lroqip5471qbmhhseo2/wasijodifaxepatanuvab.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/9rakfdp8lsbulg2fl84njb4job/lobizotomixu.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/wofolalupekigariromoke.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864813cb781---5524792101.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a880d0032e2---patovamosezab.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/walesaresodutivin.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a710633f4f9---18207119685.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_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 10640 bytes
SHA-256: fe885c2bc9b2fcaa217931fc3d6239c3c76d2dd72d203c84c62d7c70b67c1a11
font_01_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 16884 bytes
SHA-256: 15c49125cde1d6c82da5098a2a5c74198a09714beb54c80ae5ff486be4686bdb
font_02_sfnt_off00012b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1