Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c6019e03be4c36…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 21:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a72f68669c12af85722a05f91ac7850c SHA-1: 453af17ae7bb90d19af8f92eb39b2113869fa866 SHA-256: 28c6019e03be4c36236ee253ad9a576d2843a4d7e2c62032e2a8b63a30f65ba1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=pc+kwh+calculator', are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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 https://synerhu.ru/uplcv?utm_term=pc+kwh+calculator PDF link annotation
    • http://bestofbeer.ru/ckfinder/userfiles/files/7314554896.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613744aeab901---31505810591.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/mixisopasefezewutanopiso.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/xogojonupaporu.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/mazevuvafu.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/66263519742.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/takeviludajeku.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/xopebixaxovuvamirarokikim.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134c7e1dcdd7---valututezivelubodewosowan.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/7696603469.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/46607737158.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/71713894030.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/zilujorejodopa.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/33125219415.pdfIn PDF document text
    • https://promise-land.com/upload/file/29855652981.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/95389974930.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/57497935140.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/gukubew.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/51711296105.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210909091705273343.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/68739546207.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/nubulurodijolaporolame.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/88384437125.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/40744175476.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/vutukasix.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/zulub.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4e3ac0043---81136326516.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_off0000cb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB65 10108 bytes
SHA-256: 9945d7cece96bce0937e4579d38d27ab2fe78aa28572a1a6c07ca295b51f038e
font_01_sfnt_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 18584 bytes
SHA-256: 86863ad467c37677501f304692d2999f1ff4e136fc696f4408faf22a58aa36b5

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