Malicious PDF — malware analysis report

Static analysis result for SHA-256 3441080104d2c77d…

MALICIOUS

PDF

95.5 KB Created: 2021-06-29 05:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 639c33b321dec07eedbe542b412e91ae SHA-1: b31dd5985c841f6bf90103195e8a1204a514c871 SHA-256: 3441080104d2c77ddafdc136dd9fbf6c1e04ebcff092adb7c69c6709e28b4a05
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. The file's structure and URL patterns align with techniques used to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/u253al42nhn7qbj1ldtpjb3ot1/67158416776.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53ac7d164---75293381758.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5969cc893---19858861768.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f93a9bfc97680db0d588bc7183a572d0/pigawiwekubof.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/60rggfq7o8m6inu2hufvhfk5hl/lepogegugalimez.pdfIn PDF document text
    • https://aedwea.com/upload/foto/20572796524.pdfIn PDF document text
    • http://ridendo.cz/files/file/suputupakakete.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hnur3nkrg54g9lnhnscmqsrer5/4660385765.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/verawadegijoleberobukaf.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/78541580619.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4a1506f4aa32c4ce8684d42c4626b27b/74986426697.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/ruxabimowaj.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/95934472571.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/fonimozupetimexidumeraz.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7995dbda3130b44cf7261b3f2fff2902/559745730.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab685607f69---zolixegifafapu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/93ed5ecfb32902b5c00f797ec91f73a8/vezusatabifedur.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/mifivetomuwinusuxejogimas.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc39e2c0e---wapexewobimugon.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b763b8c99---4504827738.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/funuzabagav.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7c330c29f---58992693178.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210618_459F6050CC9F3EC7.pdfIn PDF document text
    • http://acril.ru/ufiles/files/kixeberunufojoxar.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/xatixuwivuzenig.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6cb97a8087bb324a27be973b14fa549b/rurifunekiduvaxowada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=qualities+of+a+good+researcher+pdfPDF 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_off00011084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11084 10956 bytes
SHA-256: 30d6c31e732d75e40eef89f98630975fc56e04b0d4c8d831da8422a5c9671576
font_01_sfnt_off000129f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F0 17272 bytes
SHA-256: f4d05c726eac553d63a0d231e292abae5e2707862b7205c48e0e3d5648d08fd9
font_02_sfnt_off000156c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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