Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7824fc5a98509e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 00:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2c78a5905c1b1d62f57dc61b24ef17cf SHA-1: 84692690f47f55497f3dab698597392150379145 SHA-256: af7824fc5a98509e482f0aa48b75f9b60cfd9cef9e50ef27788ed30e09b2f91e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://soc-in.com/data/media/files/86068336605.pdf In PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e4af894a888f5dd3c1214b19b5336435/7711916510.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/ketirezabobopopifaz.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/xetevunoxitixetav.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/33052576055.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/5798896562.pdfIn PDF document text
    • http://nktrading.qa/file/files/viletosop.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/72459984564.pdfIn PDF document text
    • http://kag.fr/userfiles/file/91866671677.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/54571742696.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/numobagifi.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/54275288354.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/44215495234.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d94b34eb7c6ea30fbb8c63a71679f167/lojowimavideribogegiwit.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/73323850500.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/96993113789.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/dijopeguberabofil.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/66633696046.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/zipev.pdfIn PDF document text
    • http://zaiger.ru/img/file/manutufilobozozo.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/62576842432.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/murexuwixowukovix.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138026ad68e2---xubobupakelon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ossan%27s+love+watch+onlinePDF 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_off0000bce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE9 16256 bytes
SHA-256: 995fac0dd0d7ac3ecd58e05cdd5d5b6debd08098ee4b694ad51ff3339f80b4e3
font_01_sfnt_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 10440 bytes
SHA-256: b5c616f887d1f1cbbce95e173b4a69de5f716a4a6d9237b443d3dbf2971ed0e3
font_02_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1