Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5adfabbb2617dda…

MALICIOUS

PDF

72.0 KB Created: 2021-09-21 03:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d1adce7babf43f2cde5d708222694e98 SHA-1: 94176b0aa76b60978a2153a0d0ef949b8ddaab69 SHA-256: d5adfabbb2617dda4f8596db8d50ddc24da84c3aa4facb48bec7cb94b7c26780
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://coolingrealestate.com/your-home-cleaner/FCKuploads/file/8488607483.pdf In PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xikusurawapotufalifid.pdfIn PDF document text
    • http://corkpotters.com/images/10170847473.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/suxinexedirenozufamixa.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/sutipewojomafi.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143e71c8f0f6---sabaxarode.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/wakemusavo.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/37339468756.pdfIn PDF document text
    • https://projetovm.com/uploads/files/tesudolivowovejox.pdfIn PDF document text
    • https://okazionche.com/files/bujaroxonopuni.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/setupexima.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210912024830-10654724087.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16131588196ba8---lojoganibefub.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/wafam.pdfIn PDF document text
    • https://casaalu.com/luutru/files/vefelijifi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ad469ccf5---69356567663.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/86588324495.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/khngqcgr0jdf0dnf52bqu31v35/wosuvakefabiwasokujuzike.pdfIn PDF document text
    • http://anindecor.pl/files/file/3579064984.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/gikumixapulunudakamog.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2711eef9bfc61fd190cd722634d3a5be/kexuxifel.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/galabudokaduviraxogitux.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/warew.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/bosifisinaziredexoleded.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130047656c0b---pepotuzezawes.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/xewiranovuxar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=index+of+paid+android+appsPDF 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_off0000b919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12B 16036 bytes
SHA-256: f773663df33f0b086bd60863865ba6bfcb9da99228dfe5e8c91953f32a80d9e6
font_02_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 10400 bytes
SHA-256: 91601e48a5fef9a8c18b23547203a436437e213c324dadc345791bf8381c0c87

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