Malicious PDF — malware analysis report

Static analysis result for SHA-256 efba1c8cf6137404…

MALICIOUS

PDF

89.7 KB Created: 2021-07-08 03:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 77e80d548deb3491b1ad5b694d18c376 SHA-1: e02375a40232947a7e2423f38af79f2651055d1e SHA-256: efba1c8cf61374046a117b891aa6d8e284746a1fa5ac580bd7c795a6a70e4310
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=does+running+barefoot+make+you+faster PDF link annotation
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a6550e737bf---7411312123.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502151146874375.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/54432140155.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/pneijbrs35tfo1d5781nae6vp5/2632250392.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/vawowosokosepudumoput.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/mifadiwi.pdfIn PDF document text
    • http://santeh.md/img/files/zebedema.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/51063892014.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f22649f2a---32482867367.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609495f627e98---90368849998.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/bedogatarejefutudume.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/jatavajixufarebe.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1d8635ce---74025329939.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e63f147b69c---12479130493.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/64883323196.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c43b21c15e32ccaca5e627d5a290c3bc/64560717527.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/rokubupijedatabijutani.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/43891622481.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/7didveoc6q9febduntd6is6601/lodugizezijakas.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/tijalunilu.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9421d0f630---bomojojemajawelef.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/banetawasan.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/62344891992.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/vufowedi.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/83001761136.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_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 17168 bytes
SHA-256: 0c10d9f7b44bc6d5cd70627331ec715a59e9ebe0826493eb2aedcd30b1391324
font_01_sfnt_off000127ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC5 10960 bytes
SHA-256: 9c6ce0ac7dfe91f6c467c4de61f7d04910387cb4a619d43e86c9ead6190773f0

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