Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e5e2004fcd016b…

MALICIOUS

PDF

69.4 KB Created: 2021-09-16 19:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0d96d6c096720f3199a07db36933419c SHA-1: 58fe2146db52e7c1a4539146aa278c2ec7e495cb SHA-256: 58e5e2004fcd016b808c01a81007ea85d7c428f7bcaa2088b2306b7e621b286f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents attempting to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=live+tv+on+mi+box+4k PDF link annotation
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143164ac512d---4300562905.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/ratemojiniro.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210903_E0D2E72364AE3340.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/rokosovikawedefu.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/vasiwufobopomi.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/teferinofasarutavugi.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/64958746272.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161398cf692655---35003230999.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/japitarav.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/punoxizexiwijezago.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/gafub.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/zuwosiwinoxidiwejus.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/juxufutowinedimamano.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/23846820309.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/88402199738.pdfIn PDF document text
    • https://aneri12.eu/res/file/ronowe.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/ratovirilukowotegi.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/lafekanu.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/tezuwulinowofekamijifo.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/dowobojokaloni.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137b67374a9e---64438913549.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/59419020185.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/54688630015.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/sojuvavev.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_off0000b11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11D 15700 bytes
SHA-256: 85b1f5646554179e920b202acda928598a6c84949aa1f6e7dbbab9abada75a4d
font_01_sfnt_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 10228 bytes
SHA-256: b06a90b5abf9b003c9c91a6617fbb12e0928fd7efe5dfc0e9381d334c071a75f