Malicious PDF — malware analysis report

Static analysis result for SHA-256 3399118f848765ba…

MALICIOUS

PDF

85.6 KB Created: 2021-09-08 13:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f445c0845ec9d52f3f905c22ce260a0d SHA-1: b7f106c0f7f0c5a33830d8866dccf9478697a16c SHA-256: 3399118f848765ba93d3e0de876ecb11897b411eb576728d97aab46423ef8f75
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The PDF also functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an intent to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://inwebjor.ru/uplcv?utm_term=kalender+2019+a4+quer+pdf PDF link annotation
    • http://cga82.com/admin/File/kawatunenekelofogezakari.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210904133824.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/67243418398.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161304bbddabee---18503184775.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/21605084100.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f88c049cf5---xinarofifome.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/69078058453.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/60035931513.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/xuvupiwufozagazirawumu.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/jenutemas.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130403c017e9---40965210311.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/8970208162.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lleoagobchcd3adi9m4jmqfbbl/todedajosekutidad.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/56046bca6dfc2eb91c63896905aeb9aa/maxuvetixik.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/vijulowa.pdfIn PDF document text
    • http://com123.vn/uploads/file/92512424989.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/bejalagu.pdfIn PDF document text
    • https://novitas.ro/files/49449056205.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/dadiwukikaja.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/reratawasuvodivugavu.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/kekomun.pdfIn PDF document text
    • https://campermagazine.tv/public/file/41836144322.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/zufafofapidave.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_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 21336 bytes
SHA-256: 85bf0840322ea394759d534dedb055e0832a2205db1eb1b3f9f0bf70e6b97aec
font_01_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 10792 bytes
SHA-256: b1eafa744fb042c4d175aa1ebe9613c3c1b7d56d80333abff1053f664237e35f
font_02_sfnt_off00012f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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