Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe418564da43923…

MALICIOUS

PDF

90.5 KB Created: 2021-09-05 09:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0057e03b423f5255846a3c17eaebd4d SHA-1: 74884fac09dcb02f33a1c9660372e78d11201f2a SHA-256: 8fe418564da439238348625e6c9fb531159bcb5268067b57aa80ecdba11acf36
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, including a link farm hosted on compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload or redirect to a phishing site. The presence of embedded JavaScript suggests it is used to facilitate the malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=guthy+renker+fitness+flyer+instruction+manual PDF link annotation
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092c05a5b606---17628681451.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/xobobokutufusokuwuxok.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/23960572964.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e9a6c5c8f---rofatufagibulidinu.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/darekugoxinikuruzuvatiji.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/18637497428.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/47172411207.pdfIn PDF document text
    • https://noventa.cz/media/files/file/75287412157.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/3f4l9rcgar94u7q3pndsvaqqb3/12170198008.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/54785797124.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/8027e51def61a509373008a827086b2b/mokulugarubipodalon.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/fitorovud.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/a4a1ean9gi3lc28uturvbs1nj5/belufalowifa.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/28808913292.pdfIn PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/figomupe.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/90093558544.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/77d61fa3fdcfbbdb71800f7f4e320726/nalowojosukipiju.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/12457109625.pdfIn PDF document text
    • https://foreningenflex.se/anvandarbilder/173/files/jibekejujabuzigilumitekos.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/516888172.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/nidopepimazuke.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/77753287794.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/vefogikasuxuwozuk.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/8919692297.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_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 10944 bytes
SHA-256: 2064e6115b3b77ffac97385bc4a9cea8037f886053cfe4050f0a386ac0306c7c
font_01_sfnt_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 20300 bytes
SHA-256: 622e3a212a62171086aab9eb8056e952066081fc5ceb0bdb27f5897d5693b172
font_02_sfnt_off0001440a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1