Malicious PDF — malware analysis report

Static analysis result for SHA-256 b863c8beb13513bd…

MALICIOUS

PDF

78.9 KB Created: 2021-07-20 18:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 018c035e5fe3c2db8049692fb3fd7ad8 SHA-1: 613d1234fc0d374018758b7783ea65d9c4a62f1b SHA-256: b863c8beb13513bd850383affb092a794fe19726bf458d408102311c1f399383
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec47415068---79794841153.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8175iqv8llp1ppfoadav65sd56/94200239013.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160edf7ab5f025---jawejozopumusuzusi.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33406630b---39142602265.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f142046d1d---67687635800.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/e17f95e9bb0a3eec39b47847f38d35ec/sitinomigetekabolumi.pdf
    • http://watch62.ru/files/files/wifobusiva.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c664658c072---17378489656.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/6439ea936d6c6fb0c7bf00aa9428cfc7/rozolilejimodol.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/f9klkf2eme52gvkmpp0me8ncvi/58130961349.pdf
    • http://kaowei.tw/image/files/20210601_222952.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9tr5d2s1g91uciaglu778kcmc2/79378131263.pdf
    • https://hashtag.school/userfiles/file/bozovulokimijubu.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/70792825304.pdf
    • http://suvagcentr.ru/userfiles/files/buwafidosukugusewuri.pdf
    • http://e-skala.pl/userfiles/file/widorarusizalabe.pdf
    • http://inlygiaylynhua.com/upload/files/77462868530.pdf
    • https://lecapsuledigian.it/file/53343482296.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad188322f76---pisugoves.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b88df30b5f6---gekuwojizivofigimisaj.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e8eb7d7c---16558592067.pdf
    • http://www.polni.si/Images/files/xugelamafomemujozim.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/bacd09731d58bce5a60e4bf34080cd22/tarewikepewanewob.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cde655cdb---wetogaxenewipodiwajolub.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=completing+the+square+worksheet+answer+key
    • 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_off0000cf81.bin
fe2dba3127b9b571684de0b6c3972268ce2e25e40fc045ab1798aef0dcce7737
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF81 11268 bytes
font_01_sfnt_off0000e97d.bin
161781273b8c9e17541426bb74abf2fa9a0b5adbaf09e9f2fca26ed8c1230016
pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 17004 bytes
font_02_sfnt_off00011615.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 16792 bytes