Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb1603e5d33a2dc…

MALICIOUS

PDF

78.6 KB Created: 2021-10-09 19:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0116e9ad9948c158996d693f5cdb3b01 SHA-1: b54fa0b3e5e4f524ec36afb84ce7db08c5acc97e SHA-256: 4bb1603e5d33a2dcf279c1912eb5fe8371dde96552a474bd8802287536109670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/uplcv?utm_term=hot+flashes+followed+by+cold+chills PDF link annotation
    • https://avenue102.com/uploads/file/55349994026.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/24968712920.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/1808115747.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/gozubuzixonusasumin.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/revafijunidenitufiseruru.pdfIn PDF document text
    • http://wjcopy.com/upload/files/49766485266.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/73157495072.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/bapuzejam.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa6ea78d4---52342280220.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161421e3d26895---66056379766.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/44271769030.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615c21d99ce24---maxosodon.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/lidunulokivoxifodog.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/woxexujipisudobuva.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/0radk31etllal9k1tknlq63hrs/19175866053.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/40889935450.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_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 17244 bytes
SHA-256: 79a303bcb1bc1cf56dd6ecd9ff15b8fda302529db256f3f88c041c04b5eb2506
font_01_sfnt_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B0 10700 bytes
SHA-256: 84e859800a120adda76e23cec3b0a0801dad2cbeb33ce25b3d662507800d0284

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