Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79c9a0f59bbd5a9…

MALICIOUS

PDF

97.6 KB Created: 2021-09-08 01:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e26158202a17d3eaa3b6d03ab471ad3f SHA-1: 3ab5f8f45136da6c3befd73b467eed22025e70c4 SHA-256: c79c9a0f59bbd5a959a6ea3b8f3a6ef685eb75913b728aec1c84e2a697b54de7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to other PDFs hosted on compromised websites, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics and URLs strongly indicate a multi-stage attack leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/97d30a3ec7b16ccdf915a97e5837947d/72394045076.pdf In PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/jotud086qe6cqk2ve8ulpc9dbi/70615176274.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/0e78332815780ac3a776106041171d44/82315376914.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1c4fa7996e---japajama.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/remufiz.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/54516174386.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/24969190930.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/12969197111.pdfIn PDF document text
    • https://jin-ji.com/upload/files/loxufajuvufenasigizodoro.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/72926919505.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4afc29f25---37097622756.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c1f6a28dfb5f4d3bd83d9eace08b43ce/varerekagijaziguzusu.pdfIn PDF document text
    • http://elitacasa.it/images/file/94104788123.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/rodijixerirefarida.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/52321590646.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/6639856105.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ehgcbsfvkhga3bbbjhmv9859ko/kinuxavowefesusutorad.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085f57373ece---zikulusajevaxilujubasit.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/74q4an1c1qois10e7gqn7q96vr/gividanef.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bab2983bf9f---7031048235.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/56458488540.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/41c616ba0e0a8a8fa156a858106907ef/nikubadamekede.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a1ec8c8e86e1b15e906e71d97afd2a56/12551860580.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/vebaxisak.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/52730977172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fon%C3%A9tica+e+fonologia+do+portugu%C3%AAs+pdfPDF 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_off0001050b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 25220 bytes
SHA-256: 9c9198ce4149190c91ae4f1248b6e0b0c0ad7facbab396da9384990af8b60378
font_01_sfnt_off00014505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14505 11188 bytes
SHA-256: 8a86e8ccc8f458dfec49ace679f5393e1bb58fa8ff86211160ad30cd0ca677e0
font_02_sfnt_off00015e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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