Malicious PDF — malware analysis report

Static analysis result for SHA-256 77be190b8994b2f8…

MALICIOUS

PDF

85.8 KB Created: 2021-08-21 05:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c21d744ca726a52e5faf402937940163 SHA-1: 7867a97aeb02a3dc180d6efd937bd0f7e49e7ef4 SHA-256: 77be190b8994b2f8c2fe65a6c17911577dea28ac2cdae1b00c86fb687784bb97
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload or phishing content. No scripts were extracted, but the PDF structure itself is used to host and link to malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://alteredcompta.com/buddha/ckfinder/userfiles/files/bepegapijuduxifig.pdf In PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/xojivivotimaxazipe.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099baa56b0d5---rotobataved.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/fejesosiv.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/aa9e0b2a44953cd233342b2f9a64c1ba/2620193220.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b13d03e507---72446388201.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/somovifuxota.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/f5d556fd0a89840b692b6be0b8c78b33/kinofuwifavab.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a497ad6c0e8---56097970775.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/pulagafiwurete.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/vinibixaputafeginizo.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc137a8544---somukuj.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1ce2d7c9e---90685952795.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/34657632731.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/9mu78sk9m7t5tso8ladhhc6asi/repupekexunidesunarikem.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160753b639dcd8---4862167252.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/kewawatejapinobafaxutumo.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/51619726529.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/7q62o45q8e0csmhjnn7eeef3m6/wesemegixiwuwesewi.pdfIn PDF document text
    • http://aps-mes.com/files/file/ranip.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/bosenakirekixeronaf.pdfIn PDF document text
    • http://dges.in/userfiles/file/lonabavuxako.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6o1sogfau6kmfp1ofq7j70pbub/vosiweseg.pdfIn PDF document text
    • http://bronia.org/userfiles/file/xavaduvesudubu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jhs02qca09vvqkaqpvf3604sl3/jolosoveporepux.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/64662830172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=illustrator+system+requirementsPDF 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_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_01_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 10580 bytes
SHA-256: 928d61bbd60382205996c337d0c3235813b310672fe7335d2480290c944891b2
font_02_sfnt_off00010549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5B 16612 bytes
SHA-256: f43ecc4414a38fafbafe53f880cabf2f224da7ddcb0be006739644438b647d44

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