Malicious PDF — malware analysis report

Static analysis result for SHA-256 506ba97a9da7c324…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 00:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d88cd2d4a8e955c017d7f1d3b17a4b00 SHA-1: 01be906a88b5ab0e76b17aa73e94aa6fb458c0d9 SHA-256: 506ba97a9da7c324b79f6292c767551b1b06b45acf013f4964e4d603cd7046ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/a0c65ac1aba93a12a946424a409fc296/56283482699.pdf In PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/89458053598.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/95752527932.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/wuwetot.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/acfa80d16af3aa9ec7b810f0a41b4f37/nawuxawutimeputaxibasilo.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/d1qtpaecoi4jbdvup53cm5fb3c/22541353198.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/kuxekipumu.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2e75c810e66df8acc6b8add2b3f4ca83/52112747698.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1612cb04775842---migafuze.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/aed7a4797b1c357f9cdee5d92456fb9e/29768480946.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/81877933787.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/dufejexigu.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/sidojodatawibukew.pdfIn PDF document text
    • http://honghuibio.com/d/files/89100058428.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/8655897859.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/dedowugeme.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0d3d135b---vumobosotuzuruluwenaw.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/11428153019.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-28/20210828152321512231.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/buraxekiwirizuzimir.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/sizexapu.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864d74e1d49---24229000196.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/bb9580080657ee1503f58cc9b65825fd/23562469010.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/sadukojizisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=electromagnetic+field+theory+formulas+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA24 18340 bytes
SHA-256: 4b1e470f34f6558bb895ff72a56613826ea172b92da0ef9135eefff3c7edd56b
font_01_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 11264 bytes
SHA-256: d9c6d6aebb0a8750419acaf39b6dcabbf6949be5ace64c8df90bd8f344f0aa2c
font_02_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_03_sfnt_off00012cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1