Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cafec81a33406ce…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 12:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f021584cdbfc81ffc220011d4cd3fcaf SHA-1: 731e0203e504cc9844b60bd07437d142f45f3273 SHA-256: 4cafec81a33406ce93082b9c76ce34c3106f0696d9fbefa13b4d58d02ff4dec4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary attack pattern involves luring users to click on these links, which could lead to phishing or the download of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=android+1+sonic+forces PDF link annotation
    • http://cl-pub.com/files/files/sapuvimotuf.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/loxomasamim.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/96093842287.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/wiwomusux.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/bezowipixujabele.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/fidexinum.pdfIn PDF document text
    • https://eguiders.com/uploads/gejobalorugob.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161381a22217c9---74821730678.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/liwadozuxetavepepiweku.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142fc3923857---23864044580.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/lobuxorefokaxoxixagumu.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/vopupakudo.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/kujipuz.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee6f31d735---rijatubolawebusolin.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/54902455100.pdfIn PDF document text
    • https://masihpt1.com/contents/files/sevasukifek.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/76055091561.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/legozoraguxutu.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/42948574363.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/fegatonoku.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fabf5ad856---25318966551.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/63117006168.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/legexikimogurakukul.pdfIn PDF document text
    • http://pneusmarene.it/images/file/ladixex.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_off0000bf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2D 10196 bytes
SHA-256: cb8ebfe25f64c44b7923ac21ba32c1723cbd61ac9fd71afc202c9539c4186f55
font_01_sfnt_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 17248 bytes
SHA-256: 1374cba4faf63468095fe684821a1694fd76d55ddea4fd5e35fb03104f8c9065
font_02_sfnt_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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