Malicious PDF — malware analysis report

Static analysis result for SHA-256 338cf927f7269e08…

MALICIOUS

PDF

87.3 KB Created: 2021-09-09 00:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 164e656f9d5734b452a0bb48ac155df0 SHA-1: 6ab1e1a10aa3e14b1643a72d9b4b48f403abcc6a SHA-256: 338cf927f7269e08bfc70228df19f8ef93757aa6220730c5a09dbdc54c7c6e89
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. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to malicious external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=khatrimaza+bollywood+movies+2017 PDF link annotation
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/nipowupisadowu.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/23097965520.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135133d0c826---90528477205.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/562a7332ae3b6237217629f573181368/vixezedodiximotuwixakuvo.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/88057769238.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/wetopupemilobepolexana.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/54229371937.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/7764490678.pdfIn PDF document text
    • https://unaizahic.com/Files/files/57943681739.pdfIn PDF document text
    • https://biodez.lt/i/File/522694204.pdfIn PDF document text
    • http://rld-carbon.com/file/gukidikefexoderajuji.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/42432373672.pdfIn PDF document text
    • https://renetravel.ro/images/files/liboperuxomodoxilajogazib.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/buwebubopegizovum.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f8449cd91f68b9f80b20ffba1d4e8727/78019677455.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/majofitirupilajijim.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/loxiruwajawa.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/wagalixawaletaxuwiwage.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347e09ec982---12938887065.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/porudu.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/51343311810.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lurev.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf61b7fb7---zibujoduzigupaso.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/wirivumugemupeponeguwux.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/90053646562.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_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 17976 bytes
SHA-256: 112dab2f181ddbdb0bf02ed78adb5fed1d8731232006c1e598b5e0eababa65e8
font_01_sfnt_off00011cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D2 11208 bytes
SHA-256: 6fcbbd5c5a07c0c415f150ad833c835d1cf7a809c83b77fda224715778eb0499

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