Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33fcf6b4d0af026…

MALICIOUS

PDF

90.7 KB Created: 2021-08-05 09:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d84f801197e65b5b335aa06b1a594304 SHA-1: 6c3382e081e972d44617dcbdf07f2e2ab9ba9314 SHA-256: f33fcf6b4d0af0261fe8ed02ac1dabe27d223f67993b031f6a1fee3ab2654a79
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it is used to redirect users to phishing sites or download further malware. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=bushnell+345+telescope+manual PDF link annotation
    • http://csc0898.com/userfiles/file/20210718204636_ptfil2.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7f9f1596d546c135564d883df4d459f8/xodunenip.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7anjhi2c1kl8jtf9si55qhnne7/zefaradodab.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d054879869c---numubekidepasuriduwu.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/wodagusikanarixul.pdfIn PDF document text
    • http://hotstamping.pl/files/file/sosakoletiridelijifule.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/18705324411873f36bf897e735cb955d/58444170322.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2acba509---19384505751.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/begoto.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1d57bc5dc54fb1a04e99dd4ead528fe7/83572303999.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1353b92e9b---nojojunevuzesitazen.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8f951a55b107a9c4438f3b8f945a8782/30744582047.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7e37d226---26227978151.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731133d3cd2---29187912230.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/9283581208.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/95c0abfa183f37b6dc8ba81791a54a47/91494738706.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/89778545852.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/45975143866.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098592816743---86049381095.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec7d3638b---juxewurodozapogi.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/62795050333.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/sqte97nam9cfos6qqfbdhjrr22/zopugusebedoresuzusi.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/diwudowedadufavas.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/i0v0frs0qj26sml3td3266nr1c/67104414416.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/fonajutugoninosemepuvugud.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/namadijasisufoleziteli.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608274b4da552---soderapiseritajanan.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab1b2fe48---18100087190.pdfPDF 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_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 10984 bytes
SHA-256: 8d108f59d6cf4912c046697adfa9b2823fab6242ec9c8a6b00ec91ac678fbdb8
font_01_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 18564 bytes
SHA-256: e2fab087c97e359452a082f91904b2c455c7e8fd27cb45ecc2104ec29f3afefe

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