Malicious PDF — malware analysis report

Static analysis result for SHA-256 22380d3f643518d1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 09:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0fe91260e95b7278596376aa51acf86 SHA-1: 3c98034fa4877ca0d7f7da524c67679d66b14209 SHA-256: 22380d3f643518d14316798483932bc3bf217b41b80d528f637cf8baf56ef5c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or SEO manipulation scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://magnanelli.com/userfiles/file/tipigabixazepugijatuk.pdf In PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/zawajupunosegab.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/wulabifafigivewubaxidajin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e456ac677---44084737300.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/34877317025.pdfIn PDF document text
    • http://berbun.com/user_img/file/89216410539.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/zumaxolutufurisu.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/jivirixogeliduk.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/7sbgm5qh6hh906qf6co60antnn/12163341295.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c22bcb6001d43f47eb38c18c55b2e41c/26015360996.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/73481737068.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/30695220806.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/2247553939.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///23766690707.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/50655171401.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703793e0643---deruki.pdfIn PDF document text
    • https://fallsplat.se/file/87308894042.pdfIn PDF document text
    • https://kawanmto.net/contents//files/pepupaxixudapebiligar.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/kegofepovojom.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/894tegu9cqf0qpa7e1cgm0oql0/zekoxamifolibezepero.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bf9f55e74---pegedevi.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/70506459364.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/6051502812.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16125defa128b3---51585241238.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/88590099140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=calculus+2+books+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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 17480 bytes
SHA-256: c0119c1c651e28b84df40cd693e3a554dc50c4e0e3c6cb286befe61d806f0bbe
font_01_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 10568 bytes
SHA-256: 7d10dc0862334e61dd580ddea8afe7bdc7ff13d50f81733288a8121277b47ece

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