Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b20feb419244f3…

MALICIOUS

PDF

72.4 KB Created: 2021-09-23 21:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b33c01ede806c7dc591b6730370fe39c SHA-1: c4c5f54aa14ff36e64864a6857f510a274d51ade SHA-256: 35b20feb419244f3adc5352220d24bce43b9aa50165eca9d1bf95bf0fa48eb4c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329ae817c42---67093737065.pdf In PDF document text
    • http://aeronautike.com/userfiles/file/jawugudoporezujani.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210904005105382.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210906020810_923528957.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/72750145431.pdfIn PDF document text
    • http://live-net.it/file/59382208708.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/62354149643.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/92793369771.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/28368348800.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/fuzumiregonudunekufi.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/58644061730.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/voxajex.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/39863871032.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130811547c6e---dizalelobum.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/pinowax.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/a944c00dd58a1ccf6261b12d3a58a897/wojekoxenonuxasugutudu.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/zelatisen.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/32646416535.pdfIn PDF document text
    • http://packamate.com/userfiles/gepisijajebipiwuku.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614358b87259b---bafum.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/gebofekukeb.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/lijefaxetonarosoloxi.pdfIn PDF document text
    • http://delve-cr.com/uploads/72994414569.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/56093648829.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/i96pfsr6djt4ldhch9a9fpqf9o/89403238174.pdfIn PDF document text
    • https://best-label.com/upload/files/taroxesuzipufivaxetegafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=efootball+pes+21+apkPDF 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_off0000ba60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA60 16272 bytes
SHA-256: 2dd3cc00f23c1aa45b01299196e6449d8690392a43bde74a2fa6e6048eae4486
font_01_sfnt_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 10440 bytes
SHA-256: 4a5806eb8c0150ffb085b3dad9666137418827000bb1e1844ad9c9b9c0c776a2
font_02_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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