Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95616cbbab64230…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 10:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39f8103d05d7df6d024b61ad7d892b5f SHA-1: be555b27330a30a8917b7a8e196a2e406fc90db4 SHA-256: e95616cbbab64230b8d82a858d1b8a162cf3e6a2547919d29e81402d99c07453
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. This behavior is consistent with phishing or malware distribution campaigns, where the document serves as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krusomying.com/data/file/45614182356.pdf In PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/nebuberanukireni.pdfIn PDF document text
    • https://ip-pharma.net/data/files/fazidawiviwinuvoguti.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/32527994564.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/nuxiju.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/21854800304.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161470d1a36141---taxelunurapaz.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/xesumedamo.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/84492997081.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f5af74e720d25bb4170a36545ee44477/vupogikozo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613583b270c05---29356226117.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/fadutak.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/32236480744.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/bazapuperusevemib.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/45961653184.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/xiveregavede.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/zuzop.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/16898639183.pdfIn PDF document text
    • http://asid.rw/userfiles/file/gepegisoti.pdfIn PDF document text
    • http://hotechike.com/files/files/96934712709.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/monoralig.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/4234916704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=on7+pro+flash+filePDF 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_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 18292 bytes
SHA-256: dbf304d80655240cf3a63671e1ab65716b119459595579ef32d0399af8a6b03a
font_01_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 10432 bytes
SHA-256: 5809c148fb8f1018eed74d65f34f809d4a401e300810115c67e8afecd7c4c458
font_02_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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