Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc5f80e4d11e01a…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 13:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 49b0589c4949bdd5713529ddc22c45b0 SHA-1: 9400dd23e979e38a64314a3992291408f601ca99 SHA-256: 1bc5f80e4d11e01ac444f502b2de67121358c8c4be04d7a063da09bc20fd60c4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating it's designed as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161467272af306---pepalavexuzuwitaful.pdf In PDF document text
    • http://okzawidow.pl/img/upload/files/35788347718.pdfIn PDF document text
    • https://revive.fashion/upload/files/30090840542.pdfIn PDF document text
    • https://hotelcorona.ro/files/33538278515.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/57305414948.pdfIn PDF document text
    • http://373113.linker.tw/files/worobivimaba.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/gisofija.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/98802942642.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/58949688712.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16151f5789f312---20953056335.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/63040650640.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/xaperisus.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/46242418067.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/defijezufofanotaw.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/77915175960.pdfIn PDF document text
    • https://bloc-immo.com/images/retusito.pdfIn PDF document text
    • https://blgjad.com/upload/files/ladogag.pdfIn PDF document text
    • http://sjanzee.nl/file/muzepilazem.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/85dd32c3517776b850d759971f375f0b/giwarixem.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/96116349112.pdfIn PDF document text
    • http://egitara.com/upfiles/files/2446134874.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336ffcda4f5---tusafes.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/tugizijozo.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/vegafuxowemawowetoxux.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161312d067074a---zelalerexajutoxowabejax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=phrases+with+the+word+whitePDF 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_off0000b1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F5 10280 bytes
SHA-256: 6556c4703e7e759f109292e367efb29268bd32417ee7820879fe1d8ca72277eb
font_01_sfnt_off0000c953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 16476 bytes
SHA-256: b3b276f2307e5d393b84d2e17027636e04c2089524f9aed14cc5ce4780232d35
font_02_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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