Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdbbf7f4131277d…

MALICIOUS

PDF

87.0 KB Created: 2021-06-30 23:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5117cff0c670494b894b07a6509b7f39 SHA-1: b01fdaa4984d5bc28be1ef15f5ed2cb6646deb5b SHA-256: 4bdbbf7f4131277db383565f3e7f3ebe7df01d90dbbc503c75a5882ef9de717c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV and ML classifiers strongly flagged this file as malicious, supporting the assessment of a malicious link farm attack pattern. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609721a1e5b7e---48242072281.pdf In PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f3e190f5b8a74786853ba2c09ad35183/sovubakuguv.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/vabaladima.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074542a758e9---52373239168.pdfIn PDF document text
    • http://www.asslar.de/downloads/53613410803.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/vukajemogiliriviwa.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/72657342759.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6f9859a7999f589034845addc0fbc48e/narazedaxekemebolerixewu.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/9eeac82a42e4d1a5414bfab535023cae/mebotagezidugefugi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f25f3cb1c---karewetemopus.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/bolijo.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/99056156757.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab0a2b50ca---36338557659.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/40124390059.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2106fmepgk70fr9jr12pm1c3lp/pikarusavawejesavukag.pdfIn PDF document text
    • https://zold-kommando.hu/files/8817752997.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/kfo81hd7n9dj9tc4oj55jh5ed3/34737427373.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/71218121443.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/jariduwixobifajedadosalew.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/1jhpspac1hp4o19f6jivj4281j/75862586744.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/94522690037.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/pukapulemiposipelemulizav.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/90722161398.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/06/files/210630145658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dissolved+oxygen+saturationPDF 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_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 10808 bytes
SHA-256: 35683e31642d7a6c3b9ba272b51924ddb747e604b4ee9d998f22e7a85253a848
font_01_sfnt_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001206d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 17876 bytes
SHA-256: 4187dc3a99caa0ffb217e60353a14aecd787dc24d733d7b3ab3f4dc8a7999d67