Malicious PDF — malware analysis report

Static analysis result for SHA-256 092a8cc7d70e2b90…

MALICIOUS

PDF

82.2 KB Created: 2021-07-18 10:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5b2c0789c7a417cb0ca66eb11cd2c1fc SHA-1: a989bfc50e2b05e048e59935430a2f151920a26b SHA-256: 092a8cc7d70e2b90d7a6e8a0ad8f3daef7e5f8147380242bf052fcd0a6b906bf
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these link farms and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e9aedbe177fbba2e99c9b1bb84935db8/lavipuwokesesofokebixujo.pdf In PDF document text
    • http://ccswcd.com/userfiles/file/28379163227.pdfIn PDF document text
    • http://short-story.ru/upload/file/kemofetajobovite.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/19410159198.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/22tjt46c9uock5sptuf1o278jr/65697096094.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f61007ab38108f34ea18e6f05e849d5b/73060872989.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/jufizojijawizaboganu.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/funuze.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/selivevituvazebezib.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/xezajizivoru.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e8ccab8e52d8a32c24f962dd83981be8/mawikibizarafuzoziku.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//3279289064.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/80863305087.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/70528637686.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/wujedovuritojaziradefatej.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/o0i890a6iofc16b3sb1g2h8a80/25341953621.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/vojamoxijifawopebesagom.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0723786d8b909632f477b0a6b6e341f0/rodinaxin.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/kofoponojiwadoborosodefos.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ec5f28ad5b5fce071c18552aad111f27/takumonunuliseril.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/53644635167.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/pupawinopelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+watch+onlinePDF 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_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 10836 bytes
SHA-256: f1b52c512e0da104fa9ba04a5424da6877a6111de44612da352c990277f90438
font_02_sfnt_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 17572 bytes
SHA-256: 407ff022de7e48edf2155964006f8667a87da7c090b6641df6a4b63118080f9e

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