Malicious PDF — malware analysis report

Static analysis result for SHA-256 0448a0533431bd43…

MALICIOUS

PDF

97.3 KB Created: 2021-07-06 05:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9583b847eb5e30d66fcd25c9ac3d93bf SHA-1: 3b4b01495c388e7417fc8b6b81589d5c55724062 SHA-256: 0448a0533431bd4368bc3a8e509e99f2455c563f93fd6395e92bb725bc0c7933
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm designed to manipulate search engine results or host malicious content. ClamAV and ML heuristics confirm the malicious nature of the file, classifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

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://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/furopenezobumewumugozuxa.pdf In PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721707d3535---zufekugufolabidomikera.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/lizetosod.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cba6a01679---duvedo.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/4c6c2f7dfbcd04d83ba2c433e0ccb0ac/mezegewumunurini.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160df6a8e90c24---28417936830.pdfIn PDF document text
    • https://altbuket.ru/files/pemetifubevikapenaz.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/5f0e6d1d7afa6cfcfb85c8a733a0dfcb/vodaziviluvivelir.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751755de703---47864194141.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/56150516530.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/6ldmbranh26s2udcvuee609525/83019051613.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ee614fa0---vevisekoxopirijedigala.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06dc42ef68---62776335352.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c577453b40---27733920341.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a709d6a9d---20120294361.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728f49414f1---fuvufitajas.pdfIn PDF document text
    • https://upaspor.com/resimler/files/navuku.pdfIn PDF document text
    • https://fototipia.hu/files/files/22587378339.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/vakinogewanatadejovuxifum.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078e0b7ecdf6---bopobiti.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b9d471421---33839787340.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feb579bdaa---gisutu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/12932825602.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8dc719951ba631bc779f6641667619e6/fubobiwomeruv.pdfIn PDF document text
    • http://learningkey.org/userfiles/bajovibawerisu.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/jenudapupetaxadap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=not+so+perfect+lifePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 10184 bytes
SHA-256: b243fc7c32dc6d3db21463a7f748ac811fd274d76b18231a771cdba197a8c687
font_01_sfnt_off0001165f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 17148 bytes
SHA-256: c7a89f5c27770383a808e492347c50f5b62d1b7e60975c0c7b795f3f30b595b5
font_02_sfnt_off000142fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FC 18204 bytes
SHA-256: 0b25b78a8a49adce92934fcefdfb6c0b59ffb9d5011566cc9e0fbeb19f6a438b
font_03_sfnt_off00015fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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