Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a8af9bda443f11…

MALICIOUS

PDF

81.7 KB Created: 2021-08-29 01:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2112b146f4bf24235ef87da333791cb SHA-1: e56213f65d084a0d120c8758c0180633cf580cb2 SHA-256: b2a8af9bda443f11613ae86e25a0692df13ca7f0f398bffd2a639f57e9a1b81c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094a480b6ca1---popovinisinafenesinavode.pdf In PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/26221759437.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5d65ae38---nipupoxowa.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/jedesugo.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c48b72ef7aff99a51b4f8d665f9387cd/matisojekujejizironetamuv.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d0b2548e7---48753545321.pdfIn PDF document text
    • http://servmed.net/userfiles/file/gegekumagumibemewivipox.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/migulut.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/besipuxiruk.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/74218153738.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/48239094971.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607b661f5c155---76048997981.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/83575074799.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609641e5cd41b---wamerupobab.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/gogivusezuvevumasurab.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/vitava.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/31574214465.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/1bcc757c9f2f4fd63a89b3a3139b0ac8/suwudejivafabadola.pdfIn PDF document text
    • http://ktcz.eu/files/files/72786481700.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2e2adaec6f477dd1806c1ff799bd06c/67711965767.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/disuneguxibowe.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/levakawodelesedonuk.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fad11b13b8199a31682e63e39877a308/90303508852.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1628527396.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/61345904521.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/juvorepuxisijeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ankle+mri+costPDF 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_off0000dbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 10304 bytes
SHA-256: f28a095d6e8cf59c0f359cc7e797870ff5a57f64c1f21dc118a77134f3794396
font_01_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 17580 bytes
SHA-256: 6b6d74a0aa04dfafdef0e68f3d6ad50c0669d25cbb51dbfc354e9a13ea90492b
font_02_sfnt_off00012059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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