Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58c62b7059511d1…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 03:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60e97e67685d739131679b00152773e4 SHA-1: 0afcf032947e970a202067faa5d2193827c685cb SHA-256: a58c62b7059511d1b44de3e1e3b3ed798a59d88fca9321d4c1382da3cb3f124f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and potentially malicious content, as indicated by the ML classifier and ClamAV detection. The heuristic firings suggest this PDF is part of a link farm designed to distribute malware or conduct phishing attacks. No scripts were extracted, but the presence of many external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=subject+pronouns+spanish+worksheet+1 PDF link annotation
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/77d8419c3c918be8634e1daee83fc016/94403559642.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/47908826864.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/17449896468.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/7189643568.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8f5bb56971929c67cd4f44053cc4f18a/fujizovonosekufapituz.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/zifapebiwatubodeg.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0c88a3e93999e5d0fc51549b4ccbe419/73672508320.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/dbd99f5f606270e707c6a5ef561471f2/romajapasafuxir.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/62884764552.pdfIn PDF document text
    • http://apple888.vn/luutru/files/rajovipale.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160cde9046ad62---21842237211.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021061017112073499.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a326b4c1840---dowexe.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/dadizuno.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/8022714384.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/87479740747.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429101121891175.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3a06f26a4---fivumuwidid.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/07cc752383cfc7e3a913f43c87a9cc2c/rozewarowisaviwevumizaw.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/sorexezobalulumur.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/mowepejopaguwizisiwiko.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/12743059010.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7a83befbc50b6f965b67686ef829d1a9/91548505573.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a021828b2---76931169306.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_off0000bd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 11100 bytes
SHA-256: 8b26a7409174d0a539898f75ed0c2285b5785e064c5ee203dd04b9028ea0eab2
font_02_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 17988 bytes
SHA-256: 2700c369730bc05e6818e9da6206d6c102ca2e2eb1e8cf3d81e964ecd5c68c41

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