Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c6e48fd8093b04…

MALICIOUS

PDF

72.9 KB Created: 2021-07-21 04:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35357ea82cd7004d6a2db3e3d155172b SHA-1: 6d39c1ed1935f1fe0d99fd22da64311880b30e49 SHA-256: 50c6e48fd8093b044752c94207cd649a536ebe5abe86e52c0adcd55efcd994d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm that points to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the ultimate destination and evade detection. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://acryl-bg.com/userfiles/file/lapavovupexe.pdf In PDF document text
    • http://tecsun-moscow.ru/docs/file/kilanaxeronaga.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c280887db2---73039547988.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210503055423_1356606155.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/sadukowo.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/11859742675.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/21907060d721953f0b360848e970d931/25298176675.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c9f168c015f8985ea42b2b5d8aa2a504/29549821712.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/raxizufexegenu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/85390891011.pdfIn PDF document text
    • http://protok.pro/upload/files/gibirani.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/19484110838.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/dosurigewejoruloliv.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d499ba4294---fuxelexujevatojebivi.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/linolakekedovavu.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/6998c836a27c049850a7412324a96cf6/42110302738.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5bdf24f5e4536aa0639c0c0866701fff/kimixirevegikisito.pdfIn PDF document text
    • http://4bx.pl/public/file/zuburimubul.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/fumuj.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/ximigemesabisodetozem.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/jorepileluwim.pdfIn PDF document text
    • http://15889163.com/ckupload/files/77287767648.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf08228cd13---rofibamix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=introduction+to+java+class+8+icsePDF 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_off0000b7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C3 10820 bytes
SHA-256: 6c42c1912f7dff43756990f3d8eda87c047967752a264925ffa19fe3037db5d9
font_01_sfnt_off0000d0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D4 16800 bytes
SHA-256: d6bcb6f737cb8683491e249eff561930435c6db2d50b478dac2eeac3266041a7
font_02_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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