Malicious PDF — malware analysis report

Static analysis result for SHA-256 a277529a47e148a5…

MALICIOUS

PDF

74.9 KB Created: 2021-09-23 14:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 970ed4ef65fe28985c99534caf6a7ec8 SHA-1: f9aad4979b1d7496b66e32c6f1095a7363e5b8e3 SHA-256: a277529a47e148a58306ada7df5625151c6fafce42d18aeffcbee1e174deff0c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://weforyou.it/userfiles/files/xawozu.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vejopamewumovodemer.pdf
    • http://studioingegneramato.com/userfiles/files/bumofur.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403e3ee7434---95071717090.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/05d8a84ecc00b7993003d0e6565cf634/78647942991.pdf
    • https://adepotcustom.com/UploadFiles/file/20210906223120183.pdf
    • http://www.cemeba.com/uploads/ckfinder/files/47615005665.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4442ec667---sofagetijox.pdf
    • http://yaqeen-eg.com/userfiles/file/9587328923.pdf
    • https://canevastoilestjean.com/upload/editor/file/vajozewurivelabe.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/vekasemadatazigezove.pdf
    • http://monkey-do.net/userfiles/file/50437598977.pdf
    • https://jxlmedu.com/file/files/20210918_131944.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/86581345063.pdf
    • https://goldengatetaichiqigong.com/userfiles/file/7595064932.pdf
    • https://webrobogo.hu/kepek/newexorol.pdf
    • http://mptech.vn/ckfinder/userfiles/files/nifas.pdf
    • http://altinay-law.com/images/file/wagumugogedej.pdf
    • https://5703n1n6999-6a55.com/contents/files/62215809039.pdf
    • http://xnucleus.com/members/member_images/files/32448999066.pdf
    • http://enovosti.info/ckfinder/userfiles/files/53494399996.pdf
    • https://baongochoa.com/upload/file/dopizakomexikizudirapox.pdf
    • http://hurtmar.pl/Upload/file/gupudufudinotirew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=install+hd+streamz
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c43f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC43F 16792 bytes
font_01_sfnt_off0000dc51.bin
1bd70c2019ec9cec74a254099a87bc46f6b25a87621b053a7fd4fa87b10a8a6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC51 16604 bytes
font_02_sfnt_off00010721.bin
898d969aab789c77ac43d0af69d17d131e42c067c7a2b51dca71eea8cd584da2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 10312 bytes