Malicious PDF — malware analysis report

Static analysis result for SHA-256 9584045d4fc73e10…

MALICIOUS

PDF

93.9 KB Created: 2021-08-02 05:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d9f6fbec8c3d40cccd04951636ae0c9 SHA-1: 7654173755f80eefc3a1e9e1549fba3bd745479a SHA-256: 9584045d4fc73e10fe6c8dc1154269a488c415b3bcced72580b73c8bfffb4d24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or redirect to malicious content. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889ec119bb6---8266267838.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608873d170357---juzujajugegelesajud.pdf
    • http://madang.eu/f_pds/fck/file/kirakovedawavebogejagode.pdf
    • http://bluecars.pl/userfiles/file/pitezozesuvaxoziwipip.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a678c4033ef---niwagerajevuwupolejomuzi.pdf
    • https://jeneifogaszat.hu/cikkdata/files/68783525037.pdf
    • https://iringmalaysia.com/ckfinder/userfiles/files/32614323883.pdf
    • http://say-international.eu/userfiles/file/gazano.pdf
    • https://ipekyolumedya.com/resim_galeri/file/vanulo.pdf
    • https://nguoixunghekiev.vn/userfiles/file/tomopuxigasujunet.pdf
    • http://assushop.com/userfiles/assushop.com/file/xiludarekivazosudunebej.pdf
    • https://securitydm.rs/slicice/file/lemisadujeli.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160830d2d606d0---95512488192.pdf
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/44802413524.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3498d9cde---bafenu.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608398a8cee68---kotujoru.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840e8d0a3f8---xegezadag.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb750ea88a---nijaxevikulezoli.pdf
    • https://bwawarszawa.pl/upload/file/jaxeratisupeg.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071e423cfe1c---sedomusovipi.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/45039772151.pdf
    • http://toyotacri.com/userfiles/files/kerumepananigobojevonu.pdf
    • http://hmconcretemixingplant.ru/d/files/mowode.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+connect+two+onn+speakers
    • 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_off00010baa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 16792 bytes
font_01_sfnt_off000123c1.bin
112c5b693be535f628ecc87134cff4f72e7e6cddf9360abae406c36bd2b122df
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 10400 bytes
font_02_sfnt_off00013b7f.bin
052aff4559ed1d9c2ab4552fd61949222cc4739bc40801378b9d010dafc152fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7F 17672 bytes