Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c759bd64d3f7da…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 13:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 85d362a452bd3f85951c743eeddd184e SHA-1: dbbdbf80956cb92b964d6ab780da2b3e7fbe82b0 SHA-256: f8c759bd64d3f7da7a2e80a777fd1e87499cf1eb154d8aa2a0925d87ed4a1036
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress uploads and disposable hosting. These links likely serve as a lure to download a malicious second-stage payload, as indicated by the ClamAV detection and ML classifier flagging it as a phishing trojan. The embedded JavaScript is likely used to facilitate the download or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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 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.
  • 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.
  • 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://catamma.ru/uplcv?utm_term=droit+international+priv%C3%A9+fiches+pdf PDF link annotation
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afac982a577---pugigotenojux.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51224210326.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/g5q0qb2aibd0ql1epbcl3a1v23/fazenaxaxe.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/sadupup.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/nilaxatotuxuwomifozipubuk.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/4492742593.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f48f674232d---wukon.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/25698460907.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d65c2e9a4070fe2efc1154289da6ddc1/64864118367.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/loximipowotinoretij.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/sebapegotu.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2264c119---41588790950.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/zemabejibutabowiputizama.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/19260087288.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098f8773d85b---21089865341.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b1fc1cf5---dawosezowuwumitumilidutu.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/vexinesupaxuroxaku.pdfIn PDF document text
    • http://abpaluso.com/upload/file/wuforobamatujepobimi.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/xibevibureziraduz.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/89808471813.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/95502976743.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/64627180267.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_off0000d0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 10936 bytes
SHA-256: e4485d236a8257b2457aded75228ac33a608f77b0ff7837a3851cb72fa18516a
font_01_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 18468 bytes
SHA-256: b0fd96a93b0e99d39494c322b894fa5c48304b000c96c511688304fb5b906a57
font_02_sfnt_off0001184e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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