Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cb1e7c07a6e45a…

MALICIOUS

PDF

71.2 KB Created: 2021-09-19 09:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 391de01c00411605c23da60a59c6752a SHA-1: 8d67be2cde0f2283c9f5310551b68991995a5b6d SHA-256: 41cb1e7c07a6e45ae50202b91791d25284e4b36e3d105eb060e322d5337eec0d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to external sites, potentially for credential harvesting or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cornerstonelaw.eu/userfiles/file/53332630401.pdf In PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/tubiturovobabok.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/33315433769.pdfIn PDF document text
    • https://bczenekar.hu/files/file/xitugomu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f052387c48f768294d6105830237ac35/gesijimivirogun.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/48755986330.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/ragatusozebi.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/mopib.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210916102955.pdfIn PDF document text
    • https://matrixx.lu/images/xurajotevuna.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/nedotivef.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/petekilas.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/gowen.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bbcda6585---bakasejuvalowemaliwuxes.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/90572209394.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/wuneto.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d60528e517794d4175b70aaf5d71f242/86404544813.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/45493150087.pdfIn PDF document text
    • http://www.polni.si/Images/files/27216653562.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/6414186229.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b88b3cc2eb---50140564750.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/984d74005f88963f3d8fc593399b375b/vimirujasofarofexoda.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/22942942442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=emulator+games+for+android+free+downloadPDF link annotation
    • 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_off0000b50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50D 15880 bytes
SHA-256: a7ff1b8365030e2d499fc90e9ac7cacecda5164774f058a64f5b0f79d1e0694b
font_01_sfnt_off0000de06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 10868 bytes
SHA-256: a07f758f5e02c445b2bf2e5687a155b39be94d2ff23d82d88f51fff676f64a6f

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