Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49a8fe8e1a21bef…

MALICIOUS

PDF

84.0 KB Created: 2021-07-02 22:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41dc08dfba4e2f5431c3096bf7dd7c60 SHA-1: e4f1ab399752a5f82aef75762d062b54d5896593 SHA-256: b49a8fe8e1a21beff001752202cf677865c4a798533564611e662e6352683a08
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal being to lure users to external, potentially harmful, sites.

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 http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7eb85ee2---84851584204.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16092863dcd44d---dabosereketanub.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/68ddeae50b63fccb6fd066acdb559cb2/9789167007.pdf
    • http://alpha-th.com/userfiles/file/59563769932.pdf
    • https://patc.fr/imagesfile/7991331590.pdf
    • http://sosnovgeo.ru/userfiles/file/74135728862.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafcc8216a3---24861589806.pdf
    • https://fzclicks.com/demo/files/editor/file/walosirox.pdf
    • http://movitecnic.com/ressource/site-image/files/kiruxozareloperofa.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609635b7c57e0---vibam.pdf
    • http://webbuilders.com/files/file/vilepeluvowaweniwuxududu.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/26a69d70a719533793474154d8f71cef/94646800122.pdf
    • http://arebiatours.com/uploads/files/favevedezukowofe.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b81674174---mikixaravapam.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/54dc539d2f4312dcced3e7e6a18107b8/kibojefigibuditenojaxox.pdf
    • https://p87.hu/files/60260537619.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160722fccd463d---84832636976.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7f4cbd0bfdc047928bd48be678f4c27a/79833720788.pdf
    • https://angkoronetour.com/userfiles/file/situbiresasarowovigexe.pdf
    • http://griswoldremgmt.com/uploads/files/gutilirewunifudajazajamok.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718ca6eee9d---78193334483.pdf
    • https://oklogistic.lv/upload/file/sonuzerirojuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=age+and+weight+chart
    • 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_off0000e835.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 16792 bytes
font_01_sfnt_off00010047.bin
39b2c6dfd0b86ec3371eb04dd380ca3bad68aeb50b89b18e634a86d896b56153
pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 16712 bytes
font_02_sfnt_off00012bb1.bin
865474e2d358f63c3aa80c58fa54df35cf4f11f551045eee1409e4f1b9234421
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB1 10384 bytes