Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b55baefda615625…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 12:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be0d4ce6e40130bd5e53425e7804af41 SHA-1: 86e5c19eecc673ca2e5a6b6db1622f0ea604883c SHA-256: 4b55baefda61562546108955101d48a137c765a65e076498da7c541a30b2cdd9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://minervatech.work/js/ckfinder/userfiles/files/90239803302.pdf In PDF document text
    • http://nktrading.qa/file/files/bamifu.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/82293966593.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/nazubelumugewipemedek.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/3279654621.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/13202874543.pdfIn PDF document text
    • https://tipresentoio.it/images/file/88957642473.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/21790772246.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/77714465821.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109050534038947.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/42974083687.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/porim.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/tunumezemoduzananazeteza.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/bujeb.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/27224514286.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/59662703076.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/faguwigiko.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/jemesilalaxabubix.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/giloxexajuzutalonokuv.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/85839554217.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/zafosajekejelomawisafog.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/vakiwakaloterusojapit.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efdca274c4---xekavijenosefos.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/tuxuzigodowixufaninuvuz.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef3aeba96c---27732956291.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a7549a4c---wibonosirakodexesolikor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ensayo+sobre+el+turismo+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_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 10996 bytes
SHA-256: 5be34825a6a7edf36edcd2a10eb0e2868aa393dd021a4c44d7afc8768ac3a0dc
font_01_sfnt_off0000f0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 18096 bytes
SHA-256: 19438a6e4c397b1468fe4c046119312ece4a35fac7635a40c0e0218e0de0b72d

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