Malicious PDF — malware analysis report

Static analysis result for SHA-256 f421f86e4c086aa1…

MALICIOUS

PDF

86.1 KB Created: 2021-07-02 01:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6f964feada6eef5e7243bb280c3478df SHA-1: bcbc69729af65fc072c118418def1723cc557911 SHA-256: f421f86e4c086aa147cdc059198b6799c68294c618e7f562ead596de1ae60fcf
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to various external websites, some hosted on compromised CMS platforms or potentially disposable domains. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bodegoncriollo.com/userfiles/file/zesenisawo.pdf In PDF document text
    • http://caryhigh1987.com/clients/41333/File/51593005876.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88c6aa49f---74220604924.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/kutaniwanemixadefut.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/h96mobeqh9h5rl142emofkt1r4/27257321222.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/8984336876.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/55713606942.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/17749096662.pdfPDF link annotation
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f4361d9a4---kefamesovuturoxusilizal.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/p2msi36mt1tqp74hj899kpcnon/pusegeto.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/aeqa9hg0u9ab5c6lhmoqhj7r5p/gimokitaris.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0227cd3fb811c8133036d104e958bb18/bekovitopagulenon.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/xevegukol.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/nkdt5uji4lk73bmlsumsfihakq/zavuj.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c75036188---lekip.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b316d86a71---23842803383.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/luxoluxenevoj.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9ae2ceae---majegakadofeb.pdfIn PDF document text
    • http://wych123.com/upload/files/pikoxorekugomiluvu.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/95405233239.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/5504ae5ccb7d58b9a44263210f0b62b8/tavuk.pdfIn PDF document text
    • http://aps-mes.com/files/file/malewifajasarer.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/rudoxedigexamojumeso.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/75751159606.pdfIn PDF document text
    • http://sushi-belovo.ru/files/15146524231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=slow+cooked+belly+pork+mary+berryPDF 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_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 17520 bytes
SHA-256: 0ae9365107486fe8c7440918e480d9435796b8756d6819358561751866fd48e0
font_02_sfnt_off0001311d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311D 10720 bytes
SHA-256: fdd44f9cdf3c4f8c8b26e544ca8e13fe7e18bb8cee2906d61b186b89a3b02680

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