Malicious PDF — malware analysis report

Static analysis result for SHA-256 275e28fc484b2682…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 03:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a162b30b64b7392820e87ee4ef0da077 SHA-1: 2f92b105a8ba22c27a77a0e7257da20cff984655 SHA-256: 275e28fc484b26823df6eb2417aec0314c569c20f8af0ce25c6345c4ccf73bea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many hosted on compromised CMS platforms, forming a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple compromised upload paths suggests an attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ncqoag6g8k4ipu4nq5v7vqmdas/45220820575.pdf In PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161364dea16925---70345793674.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/37632215105.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/bewugoragudilusipexu.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/3034931789.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/53051604869.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/44861094853.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/legovilomuvofojufides.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/40696752759.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/xivazajamuvasonosopamo.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/94357072959.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/63581233585.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/gevibidazu.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/75865322963.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/rabakasuzugam.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413157864b0---15811305688.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/87234361626.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/26196444517.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///202192614486823.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/2755251830.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b9158be4cba35887aa5e6a60a6e693f/68854882578.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/18395315219.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/53563249319.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210911_082912.pdfIn PDF document text
    • http://cga82.com/admin/File/8632614138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=note+10+plus+test+modePDF 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_off0000db3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 16900 bytes
SHA-256: a0a898da82c9027a82e55dac8671a8922b3112e95fd08282c3dfca9dc3908d1d
font_02_sfnt_off00011f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2C 10348 bytes
SHA-256: 2ad3f0330d4188c37ab916395cc2b6e2479d68427799576e6c61c235375baa0b