Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd4b760fbcca7fe…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 20:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd8f962129cbbb5af8571e9d782c3884 SHA-1: f467a6ca85f69c12f98fc8d6ec9a1874a16304e1 SHA-256: bcd4b760fbcca7fe7517b62649572db314f363d89afcdaf171aa09fd60546912
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=download+free+bible+commentary+pdf PDF link annotation
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607031749191a---nepisenubom.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/51unrmeoo59mrr5dmi8t87kjr3/mimenosowutuzovodowufe.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/63496101a57e122ed8a51cde7784d18b/50978443542.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/makaxesarixetiri.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7fe9874c---81430579452.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/vaviwomalodepiwiwisamo.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/84639738347.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/8udgjsei8b5i0m7hm3v5llc790/87176086755.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f1303690bdef147f60aaea79f07a8e67/kapudidikajigubifamezaro.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/91223242680.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6f5f965f8---woluwaz.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16081243fb4f6f---xivupanesiletululapugogu.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050203513151.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/puvikimatapofokisalap.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/lidekobusefife.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077d842c5792---tusagubajemuwifit.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/a0300e67e6b0180b2c64a1ba7729e7db/54356121670.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ef75ce058---7071640497.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/dufujuwadotal.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e8e29aaf0648c2db6c9c2de696bcdbc4/babimuzogemekinupus.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051322002357.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77b5b50e31---punagujubuvikalunan.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/tukobuxi.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c32bf5ce9ee1675e7f74a6f2f10420c0/baramisidanuja.pdfIn PDF document text
    • 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_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 10952 bytes
SHA-256: 7cf1488fe2f4fad3bf95b79d841b423e5cd32febc91fba6f0a574cb07a70194d
font_02_sfnt_off00011d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 17520 bytes
SHA-256: e891cf2fe73e794ed79f3da69da94ffbfe12034f30bc892f33007b5f8210fdae

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