Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28b8b7794028662…

MALICIOUS

PDF

92.2 KB Created: 2021-07-03 06:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d411eb24502b21628becf9bf3c57c8e SHA-1: 63894a71d9bb9e3be2dd58d5f2fd7122dbf1047d SHA-256: b28b8b779402866250c9681e1895507a691ec18451fae433c0f52ee3bf722219
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, and uses 'utm_term' parameters suggesting a link farm designed to redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://ketchas.ru/uplcv?utm_term=outriders+save+editor
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f26fecf253---fasabalamux.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b7724722---35376313756.pdf
    • http://kashima.cc/userfiles/file/lesufokanexunoduxin.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qgle1q3602o8r6cuta9r07dnp5/dokepewesupara.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/adtvtcd66p3ernmi6bsh0q11ei/56257568070.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/to2piv5mmv1rabavulm5mpj8l2/tixurugawefexeniveromorol.pdf
    • http://faxik.ru/ckfinder/userfiles/files/52128422544.pdf
    • http://sochisushi.nl/survey/userfiles/files/8388878345.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ca68365a---58610647533.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3fb74394---77408377749.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ab2b34f61---semopagopanago.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1bc69a057b57651fd21f80f3ed19fc9a/durasevufozolaxeranolif.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbdcd1fb57---zupasi.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c7ae0121d---fujaxo.pdf
    • http://amon-syotengai.com/userfiles/file/guvumutivukarifanene.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e659f9d09b---voguxumojonekadak.pdf
    • http://grupophi.es/uploads/files/nenamikarosarozeze.pdf
    • http://www.bandungmesin.com/file/poxobabesudixefatamu.pdf
    • http://goteneplast.se/files/images/file/63220333911.pdf
    • https://101doctor.com/uploads/ckfiles/files/60b4e7a04bf35.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989de6ea79e---47330042603.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/bd457652f5f9bbdbf2b568d0af56f12a/26653009200.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc438b5c1a---sadun.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f23d6fc03d034a037589b9b6e49d1715/20758380427.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16f185dbc8---86430112981.pdf
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/41263150079.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb6f248a59---tixemetokoxeji.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c5f7c6a35---55746929645.pdf
    • https://cyberpunk2077.mgn.tv
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 16792 bytes
font_01_sfnt_off0001037e.bin
31d664dc11b6e41101daa120bef398281ffc76bfcc4fce05c9554b67dca78c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 16552 bytes
font_02_sfnt_off00011a33.bin
e8af6285d42fac422f41560f7315b852b0fdb1fa78ddb95e5a0031971fb19530		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 10280 bytes
font_03_sfnt_off0001318c.bin
91c9cf2ef0a9a2a50bb0dd7d0778b96bdf73dd59a0158368fd91e0c6ee5da94d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1318C 17892 bytes

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