Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b2f6d5ca99fcce…

MALICIOUS

PDF

129.0 KB Created: 2021-06-27 20:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b553e266021176ab5d0e88d665cbe0c6 SHA-1: db4180cad36c591f7f836076b6ab65732badc0c2 SHA-256: b0b2f6d5ca99fcce8c5a9728daa44bc581091039d7479c20ad554264d41b063e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9741

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://crewmak.ru/uplcv?utm_term=klay+thompson+kevin+durant
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29df58251---texeketowikobinaw.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc05ad8a03---sixadipus.pdf
    • https://medsplus.us/admin/images/file/xisuxetorigazifarefax.pdf
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/25752286311.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1fb06bf84aafdc93bdc769cf7dfac110/bokorizo.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d897d5e7---ziridapoxuli.pdf
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/zesugazelipovegofizet.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/l3euov6f2e45tknglqva4mfdqi/basunojowisuwosap.pdf
    • https://rocksoliddesigns.biz/userfiles/file/40650512874.pdf
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/puxagabiwaguwelagifa.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc01471cb3---5910740322.pdf
    • http://andreaslasnik.com/data/files/wizigegilozepumajukukutid.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/mr0d22v30tsjidbt63dicvlob1/livubokepigamofenu.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/lofaduwutalovo.pdf
    • http://sanarina.de/ckfinder/userfiles/files/wumakakorimemodevi.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871aaa0664e---51384427616.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852372abd90---xisegig.pdf
    • http://ankamet.com/userfiles/file/903985910.pdf
    • https://secolink.sk/userfiles/file/nugogilukitobesib.pdf
    • http://eventologia.com/userfiles/files/pazepamomoxefuguxaloxoju.pdf
    • https://twr1115.net/files/fckeditor/file/18606955908.pdf
    • http://klimatyzacjaradom.pl/userfiles/file/lusinawovidiwe.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc14e5dfb---fojikewizatesi.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7c9239d8---3678062062.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcc7af1dce---88718793390.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e6550ef935987f5c36de1282e62b9b92/34007655891.pdf
    • 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_off00017855.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17855 16792 bytes
font_01_sfnt_off0001906c.bin
d9e2f0d19ee38e4850e93131951008ad295a68c93f6725cd35c095f4d37b32d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1906C 11020 bytes
font_02_sfnt_off0001a9e5.bin
6d7ac8bd7102e9335d0c146fa84f4fd28200a8b756806b329c90b772f9d2bac3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9E5 20380 bytes
font_03_sfnt_off0001dd4f.bin
66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD4F 16544 bytes