Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6f6a886391b56b…

MALICIOUS

PDF

97.7 KB Created: 2021-07-17 09:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2662907a6d53226a8675ed1aeeac268d SHA-1: 2c8bf99f343309de42682d3f5d7314fcc421bb2d SHA-256: df6f6a886391b56b1672755cdb8682413190dd8109685acc2747e758f00d51f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and the nature of the linked resources. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://blackhorsesc.pl/userfiles/file/lepogasupe.pdf In PDF document text
    • https://soudurelauziere.com/upload/editor/file/85572878892.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/5bf2c1e7be42de2e132e30d1481109de/30980927934.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/92030407160.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608738b1ba377---silorexokomalifabafad.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/tifufujedimafemovep.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/53753674025.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da0052115a---52520250994.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160df9e6c40680---30499917206.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/fajigabavep.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/gabobebago.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/95251505297.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/vp1ipcti6tfo9bh7uutv8bn7k0/16901592668.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/xenokix.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/zokukadijej.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/23300604970.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/35033cobgi5heghcdohvnkmcq6/buwakiviwa.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c601333e2e0---62525168550.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/7f20fa9128135b92358c7ed7016a540c/93511553772.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a677c45d4c2---volexevafo.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/rixugaze.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/812a3c9dbb880960804566ef0191da00/60046197037.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0cc983d6c531fe5164efb5b30313a54c/pipodedomula.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b88aa34aa083ad0c0c6868939dfa75c/74306407118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=firefighter+interview+scenario+questions+and+answersPDF 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_off00011863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11863 11084 bytes
SHA-256: f304e8016a49ab0b16d53ac06bebe60d60eb8cfc8fb42ab521d04f7d30803c98
font_01_sfnt_off000131b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C9 18000 bytes
SHA-256: ea29b905d0b807a7486580a7147d17baced9a4d15d274197ed93556010409877