Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76db30b8dab2146…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 14:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1717d9ac0be61747cb45b006f10c58fb SHA-1: ee49c9b1fdd73b91ce0a87c5758ac481af9ff411 SHA-256: f76db30b8dab214648825c0e19674a6cbdf34421ab649ca79473cce63883bd73
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://vasa-project.org/fckupload/file/3739796270.pdf In PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/tepupelunuwov.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141486e271c6---6783385002.pdfIn PDF document text
    • http://p-energo.ru/content/file/13481117937.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zipatoremeruba.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/peripatop.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/mv9v4dpsco41oh8obminpk36oo/digijum.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/fanukalabegozoxakogo.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/59929715530.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/palokuru.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/kidole.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/0cab15212ba2060abc0c701bf5ee6113/24571878431.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/44261264294.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/32odopu34efm1mp0jbdqn85hp1/26394689370.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/xesolidulefokexes.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/rikuwalifitopaj.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/zujejiwajofasexasule.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/fanolefusiminipozupavupu.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/57532921618.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/26121727245.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/sexub.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///koruboruzoz.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/bimabusewopobubifoxipiju.pdfIn PDF document text
    • http://kasand.com/userfiles/89885782033.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/42774536861.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/76830830313.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/xazikezewuvivuvegoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=film+app+download+apkPDF 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_off0000b39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39C 10208 bytes
SHA-256: b389d0fd9da8894e16acbaf4783de45c052c63a875921589c29733941fb1e7f8
font_01_sfnt_off0000ca60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA60 16756 bytes
SHA-256: 506154979ed983638df73951fc37376f4a25669e7ac3790a6b4322bbb4d975c6
font_02_sfnt_off0000f482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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