Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f13c5d0f463c75…

MALICIOUS

PDF

75.3 KB Created: 2021-09-08 10:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d880634678743f72e090f2be1359fd8b SHA-1: 47de0f454ed74fe4ee2c33d5072e940e8c140556 SHA-256: b1f13c5d0f463c75461aeff1fc7a346234be69cf76e6de98c3dc90a976cc1607
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress uploads and disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a small PDF acting as a link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=dionex+ultimate+3000+hplc+manual PDF link annotation
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/qtah81ftdv24ic4kf5ed0bt1u3/zidapozupozasopiroje.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/xikelaganomib.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/funepotusebisojisab.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6bdc2c5fc---26217512975.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/kixukojag.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/rr2ndk8jqrd7bet60su7ptqd32/12202106575.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/siwuzonit.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/lozazosixupedun.pdfIn PDF document text
    • https://ntc-container.com/upload/files/nunugubod.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/hrtdj49fvar9jfl0vv5okjnpl6/rofulovilupasezijelanim.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/74357728223.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/2483407921.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8d65dee8b---27534301593.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/81691660353.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/58f31882e4fc38057dffc95c4a8937dd/tudakokapokapir.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/xojivofakosa.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/32713117452.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/zewolutigozufe.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4a94b4c864732f01a4daf2dbd1cb776a/93507825586.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/buvanoruwow.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/dudajaviberogozifumupok.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/rezeduji.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/8969100774.pdfIn PDF document text
    • 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_off0000bea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA2 10868 bytes
SHA-256: 12f95d205013a788608264711a0a86666e083d9d935232fb96462e02857b4384
font_01_sfnt_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 18548 bytes
SHA-256: cf50d6f252537a32954f2b2da9661bac8d76a43d2d7659979427d56d70befd02

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