Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39f204137f20a41…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 01:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 463cc94c7b52d4b43965603953445cd5 SHA-1: 64301a3b5850ddcc99711ca40bf9c3c3fbd4a789 SHA-256: b39f204137f20a41afb8fcb950e0096805914ef07db99520bedc1c61de18daaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised or disposable domains, forming a link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://haihengpharm.com/upload/files/nevovokopidafumuduwivesu.pdf In PDF document text
    • http://dodogs.ru/sites/default/files/file/mavuwe.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/11439185237.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109150756439065.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2366d6d3c---55375072146.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/84121823131.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/v0urf6u1o1vc9mt4066tml97qf/10658049481.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/nonolakixemawo.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f6a02f2421ed1f56f1fcffb36037371b/sotutuluwoneruzum.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/4059494744.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e7cba94174c306e51e614e54062268e7/nujoxisojepe.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/safamixawamikunenelik.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/15390829915.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161423ad539755---finudeta.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d5b7f5bc0a874f9c9de098de38bf7cd2/39005687168.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/zazuxadejo.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/97008768534.pdfIn PDF document text
    • http://test-immo.com/file/genizakelekubadiwosilop.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/fopotafuzutolanij.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab579aada4---81632766327.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/37544660413.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16142081d6756e---gesoluwoxodonijona.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/42997221677.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/n3oph0qorfgeddp9q1i03tigp4/77875601747.pdfIn PDF document text
    • http://magischtheater.nl/userfiles/file/83533312712.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/58676541096.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/60558883425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+connect+to+wifi+but+no+internetPDF 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_off0000b802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD019 10400 bytes
SHA-256: 080dc392b26290f935186ffdab01ec3f1b5ae9ec50b9a9c6c3452f7756a28dbe
font_02_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 16848 bytes
SHA-256: 69dd3545634e42b382d58d82e0dd67cbc8fe603aa60d2707eb2d34314074fd33

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