Malicious PDF — malware analysis report

Static analysis result for SHA-256 337965363066bed7…

MALICIOUS

PDF

96.8 KB Created: 2021-08-05 14:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b487d882e1e3946f740d271905b78b8 SHA-1: a7706391bb78ecb42b0cc626a8d6fd1528e4d794 SHA-256: 337965363066bed79dbc1e9b186f84be1c6ec7d4e48b650b106d79173dc1abc9
236 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm hosted on compromised WordPress sites, and it actively lures the user into executing commands via the clipboard. This suggests a social engineering attack designed to bypass macro restrictions, likely to download and execute a secondary payload. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4dad49e45---gafekoda.pdf In PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/59742478360.pdfIn PDF document text
    • https://network-italia.it/file/zegivebidoxivunerejura.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/1783978435.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/felepejesizuwinudo.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/rawabewosekovakubufasa.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/2241524562.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e48168fe8---mubosife.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073f451e699c---gadabowaguwifuj.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/25403679838.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/nuturonotipumel.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a15af3463b5---26487181596.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/80814323348.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7eb4c34fe3---pixagiredusuwedetafo.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/23476743443.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/zakijodol.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/bexexefuferemanoxogujas.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/87088240333.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b1a2fc63b8625e18400d6a9fc2bb8023/27042157512.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a7ab9406c---saxixipuxumegi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d51955cec---jesaj.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/11178692442.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/19176823168.pdfIn PDF document text
    • http://ecologie-energie.com/userfiles/file/82621485034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=can%27t+find+ide+ata%2Fatapi+controllersPDF 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_off000114c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C9 10712 bytes
SHA-256: 25fcd5a559849f2fbe76df30e5877bf38745b676bf9d18cdc46454af2b72a21a
font_01_sfnt_off00012d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AD 17852 bytes
SHA-256: 42bd2a2ce66e5f02421602b44bdced4c84dcd819761382f39ae2f83cc201dbf5

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