Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbad84eb2d0acb9c…

MALICIOUS

PDF

97.1 KB Created: 2021-09-18 10:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a9e4a6f721ad2f0ccc636050549b3282 SHA-1: 63588c0cef978c96dad2fbbcf78c55ed49e24a79 SHA-256: fbad84eb2d0acb9cdf835a1e60cbeb1ddac4a78f1e55f9f8d2563870588ff705
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content or exploits. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f940b797495c91bfab413e99845f1361/67396486604.pdf In PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/37344990575.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/3289387083.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/28350468367.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/62916689071.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/007k39ohs2h7h9qtvvl78s2an0/xogixamimoburu.pdfIn PDF document text
    • http://kunbot.com/upload/files/zifom.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/nefuxatudevur.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/roveboselituwex.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/demukitimabunowaxufe.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/83612251535.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/r9hp2t2c2bpiutimjgn5eag3d4/misinorawanefejogasape.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/9813130485.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/55352103274.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8a09b2ac0---52052709797.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/15117159951.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/zufonila.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/wijetuzerexajevurixosulaj.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/mobosujejulefawitusiveguk.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109110220336318.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/5156888097.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/26843716554.pdfIn PDF document text
    • http://palami.by/images/file/bavejutidibarupelimutuw.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/zelesupofixupugomobegajod.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/38213863394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=945+north+12th+streetPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 16924 bytes
SHA-256: 59e1a27111e69ce386805883547ea62b52354074bc000933ac658b1770f02edf
font_01_sfnt_off000146df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DF 10360 bytes
SHA-256: 3ad14c49d5d0eddc75ff3020a785276fed8d62b557f23e1efa5aa495944c66e1
font_02_sfnt_off00015e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1