Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb09d3e8415423ac…

MALICIOUS

PDF

88.7 KB Created: 2021-07-04 11:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b87171f38c4b3b45f9524ebdf73cacb2 SHA-1: e38296d12c83828f0971d19831547e08c8a30e26 SHA-256: bb09d3e8415423acbfd5b2721937ff74f23dd98388022050444a0b4562842ab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The primary function appears to be directing users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/edf5de178a90b9d3f7d8ae86733ced58/suzukuzibugoromugunufuroz.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160acd46e081f8---122095067.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d19bfb4612---31450389602.pdf
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/vokudusesaxulumogipufuru.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e5480684e4f00809901f36c0a2fc9c8c/23227579640.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b245f9b5694---62668395555.pdf
    • http://eko-inwest.eu/upload/file/19258728962.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4cf6d294d141d6979671ae28e0d850df/22117369548.pdf
    • https://aawyx.com/sites/default/imageuser/file/5025776888.pdf
    • http://assistance.uz/images/shared/file/nebeporovesoxobusifegit.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/318f60be6a085be42cf487d8f2d3e282/sitegoko.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6ca4557272e030185fd462ed5cf6969d/24212700785.pdf
    • http://mtecommerce.it/public/news/file/dojatidoteborujemesaw.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607217d02dc59---18160773220.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a740f46eff8---sifutadulamuvijem.pdf
    • https://alakharia.com/public_html/userfiles/file/7727765758.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a9c3ba44ab254513deff23ac6696a74f/tiwejoziw.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/64684902954.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3a669d392---kilitilalaso.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3slib4q02qgl1lvsruhav2nfu3/logulixa.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc6465fa96---31008090268.pdf
    • http://adria-ex.com/images/blog//file/18129631899.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=names+starting+with+ji+for+baby+boy
    • 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_off0000f636.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 16792 bytes
font_01_sfnt_off00010e48.bin
2ee6a8f08c436e73edd50e25e510c92a13e351409dd701de549ab6710eac8958
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 17436 bytes
font_02_sfnt_off00013bee.bin
0c1b0126218f4208574bd93703282d28a24895816b85d7e58eb736ff1736aaae
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEE 11060 bytes