Malicious PDF — malware analysis report

Static analysis result for SHA-256 342786f4579470f1…

MALICIOUS

PDF

74.5 KB Created: 2021-09-14 05:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17901c2885d7c2d48f89975e4945c87b SHA-1: 33f89defd13c734cc26648efa02aefe0c96066f8 SHA-256: 342786f4579470f107cdb03e1b36264e0408e7ebca7cc66a1cd447b431432c68
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on potentially compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/wedawiloj.pdf
    • https://hunglivet.com/uploads/files/202109081626509025.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5a63efb98adb04252bcb31676e13e561/63790948611.pdf
    • https://sportuna.be/ckfinder/userfiles/files/buwiluvapezez.pdf
    • http://techscreening.com/userfiles/files/xotonujorigu.pdf
    • http://antonellascarpittadesigner.it/userfiles/files/boromax.pdf
    • http://ecovn.vn/uploads/news_file/xoxagetabik.pdf
    • http://bulk-supplies.com/userfiles/file/sikavibalabexedapazar.pdf
    • http://renknh.com/ckupload/files/kekaxe.pdf
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/70139746027.pdf
    • https://airflow-skateboards.com/userfiles/files/77435036054.pdf
    • http://balaton.varosom.hu/userfiles/files/gogivomugatifalujakorara.pdf
    • http://rtm-plus.ru/ckfinder/userfiles/files/99948494918.pdf
    • http://zzquansu.cn/d/files/tevodizidadiwe.pdf
    • https://learn-atdi.com/uploads/files/1681017909.pdf
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/fezejufe.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161377181652c9---rijaselareda.pdf
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/48653694487.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306c83c515a---27525459014.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fef0acf609---sifuri.pdf
    • http://isleford.com/filespath/files/20210901104756.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+ios+development+cross+platform
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bed6.bin
be0afe3a2aad81f4af7234b1eb5e1aea52b400e95e5e9415c8e3a7ec1537e0a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xBED6 10828 bytes
font_01_sfnt_off0000d7d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 16792 bytes
font_02_sfnt_off0000efe8.bin
214b6eddb8b3bb54eacf2b95f5bfd903683aefe2448357f61650d8cb4c807b96
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 17024 bytes