Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f6649a9ce9160f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 06:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2e248a8687723962cb96c13ea7b37f8 SHA-1: 8c810c07e2fde3c8904e1fe25fab6284f30a8645 SHA-256: 58f6649a9ce9160f534e9d1ccd8ede2ccccb378709af4f5538f8a4f91caa2a68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms or compromised upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=mingle+apk+download PDF link annotation
    • http://premiercontractinginc.com/files/file/bajivotovat.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/rirojumedaresekufo.pdfIn PDF document text
    • http://chineseclothingonline.net/File/minibelorenu.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/futabepulifejes.pdfIn PDF document text
    • https://adikketiga.com/contents/files/defamonuvujeterujuze.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/lagejidamox.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/6161039882.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133916c26996---kojodonovativiganevem.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210919112324.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/33043113009.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/37189786609.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/83670295319.pdfIn PDF document text
    • https://majubesar.net/contents/files/95249717527.pdfIn PDF document text
    • http://semut73.com/contents/files/naxuteram.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e6651c419b760a708bab8f697620e616/pafejozerumupotu.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347cb65ef49---95542341037.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/80498936741.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/tufadisojomatezomuj.pdfIn PDF document text
    • http://cocoal.com/uploads/file/64283688516.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba3859a82c---zaxutixiridatimote.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/biresezugebakez.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/muroro.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/sopumefugakirakubotuvunuf.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/21268622423.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_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 10372 bytes
SHA-256: 2c0de90b751d4b57e58a99595d39ccb62810d19ce19c243081213e481a072b0c
font_01_sfnt_off0000f4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 18336 bytes
SHA-256: 7418ff8acfa0e1095fcba9b23e08f756f85f6c72dee39b57cc51e857edd79e06
font_02_sfnt_off000124c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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