Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d05fe557ada827d…

MALICIOUS

PDF

71.5 KB Created: 2021-09-20 03:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7b1c7bb75274b4da4f8cd3868c47e58a SHA-1: 8cf95e8ee01a6baa28f81a0ed5bee5ff9c468b53 SHA-256: 8d05fe557ada827db8f3198fda8732109b5c90fe4dea80adbf898406e1b9ec0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://audiohrestomatiya.ru/content/file/61951080361.pdf In PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/43754709517.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210904_223508.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/73893030720.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/laferotimunuminefibi.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/kawogalodorevolema.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/96566492401.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/29154130050.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/rexosawos.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a7903a24b4d84fb1b6f3ef64c52c33e/84515405532.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/44939769292.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec0c31e65---30690383993.pdfIn PDF document text
    • http://esistore.com/userfiles/file/36555278805.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/90036200855.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/sibuwisevorasogafilovaja.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/54648818986.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/suxopiriruguduxugupi.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/40730311531.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/muladivoxevajugozozu.pdfIn PDF document text
    • http://artio.pl/files/files/14806259622.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/tukilikexawexapum.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/xavisumin.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/kekedarusefif.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f8ea0d2f---52624253435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=assistive+touch+pro+apkPDF 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_off0000b6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D6 16448 bytes
SHA-256: f9dc2aa97a13a7aee1f8bf7c7041a356eeccef8d359bfdda07d82d0f912e5d8b
font_01_sfnt_off0000dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 10560 bytes
SHA-256: be214468316f1d22f9c5ad60ad914f6ca287e81a4a737789965d997101c3cfaf
font_02_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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