Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1f43b556c3fec7…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 13:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b801b0ce0d96b62cbc909ec8268ee390 SHA-1: 24917f0d18e812daac1056c7e381ba9b3f86942c SHA-256: 0a1f43b556c3fec7c1caa9cbfb7125bcdc15e20c3b638e8a7ad239aa3e693cc1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious content or facilitate further compromise. The document body is unreadable, but the presence of link farms on disposable hosting and compromised WordPress uploads strongly indicates a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mhqitdt2tfj28io0i0r1t6aafd/wadubaxem.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a752b47341d---dulamasimuvusi.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a4kq250gdfaeuke4s1n1n51qjo/timasuja.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/78869334562.pdf
    • http://yilip.net/userData/board/file/paputinidatedada.pdf
    • https://lexconsulting.ro/webroot/files/media/98796997743.pdf
    • http://mbcasc.net/imgs/file/99054135587.pdf
    • http://france-ex.com/images/blog//file/76833386471.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c7911f6ba---10842225179.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/obj5df294mjg6b3c5dmc3i2i9b/39710767494.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b09ca5b2986eddee1fcac7fa0e84a66f/pexonafi.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/vc04hknbrsmqgh1ricp5c6putt/futosidib.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/66365039849.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/sirudasokigu.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853239df7d0---novewo.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/iuf9mg1q17tskc4n5d0suc4068/50680238669.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/26o9a8k8kdm8n0bsdmso7876e6/57176087808.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b10aeb197e---dadusinoxevof.pdf
    • https://lederstuhlshop.de/ckfinder/userfiles/files/33898141166.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f9bcac46f---nojaja.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/8a613e43b40022cae64af9cde1c5ca2f/kofad.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/885flg4g4e15vo0arg1mhknato/52900416481.pdf
    • http://myphamnanyno.com/luutru/files/71313859810.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/4185129697.pdf
    • http://thesetnews.com/images/fckeditor/file/fofoginajubifupupuduzeg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=car+wash+with+undercarriage+cleaning+near+me
    • 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_off0000ecfb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 16792 bytes
font_01_sfnt_off00010512.bin
3c75b99275b04fb0d796b2ba849ff10889c7b7f342514228734a15def044cae1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 10916 bytes
font_02_sfnt_off00011e00.bin
8feb7cd87cfb936b30e034d2b03b173c949de14e32ccda9b28c24a4e9c6d5c4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E00 16516 bytes