Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36a9b4bbbbcaf5d…

MALICIOUS

PDF

87.3 KB Created: 2021-10-09 01:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bcaa2c46b4984a953e18cb0ccc9c7cfb SHA-1: 0cad4ab007fa4d62ae0620cb1d7330227d094837 SHA-256: d36a9b4bbbbcaf5d0fec9fc138f3c4b3e91a373d03f7a19d0f57f5f9d60ae463
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://livelyway.com/ckfinder/userfiles/files/58111689281.pdf In PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/69985943256.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e84c160e84---38305710042.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/63e7773d2f4b05df7412addccd2de0b3/jugimoz.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/taxozugexov.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/tumewiboveseda.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/92337338237.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/52143065252.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1392016724615f00c7d0600.pdfIn PDF document text
    • http://epicridesnepal.com/files/76021813670.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/39893307071.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/31410315656.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/tinus.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/46862448d74825e4d45ba1484fae502c/95813111446.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/vosalimudoze.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/gej7nmk1rgifsuh0qm74alb5l2/xofojafisumofidefazi.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/60711065155.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/20388045588.pdfIn PDF document text
    • http://kdekdyjak.cz/data/12507346305.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/famadinilodazimunes.pdfIn PDF document text
    • http://honghuibio.com/d/files/70282361652.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/nekamotemizujuguku.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/693728fb35a6e96194642022306d6a81/7006549499.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/rugevefudofekuxogadalopuz.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161374c2d8eb2e---78603583121.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/74069835082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+university+for+biomedical+engineeringPDF 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_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 11292 bytes
SHA-256: 243eb662d6c90257df221849d72f0cb50b07d9ea79797b8af9da896f9812586d
font_02_sfnt_off000120fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FC 18152 bytes
SHA-256: f67b79e528b75f0527c2223671252d9aabc01468b025903c088d7b05a8c886ea