Malicious PDF — malware analysis report

Static analysis result for SHA-256 7287070b63bbd0d2…

MALICIOUS

PDF

82.3 KB Created: 2021-10-23 17:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0028da1cb1a2d5c0b331925577150616 SHA-1: ea30be836137e07c7a30bb4fca940eb9ef5ffa3b SHA-256: 7287070b63bbd0d2fa7d3154f474d5163921f2a27235b6dd5bd1100ca2c291bc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate attempt to distribute malicious content or phish users through a network of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://siangyun.com/upfiles/editor/files/45642676372.pdf In PDF document text
    • http://vivaibonomo.it/userfiles/files/66682841284.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/kufumumubogawafuzaki.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/wewujodogakefowe.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ulpqqs1mvqa7hv0qthc9m02ps3/62415647979.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/53192102062.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/77422301316.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16161c8fe0112a---66502911571.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16159765098757---98663244203.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/darujomugiwefugu.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/zemuxufuvi.pdfIn PDF document text
    • http://guowangcable.com/d/files/95819587993.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/kuwaniroxorodemer.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/14634369034.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/78786432963.pdfIn PDF document text
    • http://marymo.ru/uploads/files/fenekoxasifog.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a95c3ba2131e6f32461b0365c698c37b/porelatukitubagogu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1615437c92f99f---jixesitalotamaz.pdfIn PDF document text
    • https://timminsrenovations.ca/file/hTrH1bEfxNxXMl06.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/41679297790.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0cd0ba335bb3413765187a1442ea724c/salufezesasasiginif.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/sulikazalu.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/murowalajoduribikexaz.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/99046575788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/23D8k0Ec_6w/uplcv?utm_term=give+me+new+faith+church+live+screening+todayPDF 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_off0000d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 11328 bytes
SHA-256: 6d43fd86f69191449f543876019bf99f8e06c3c34b46c18805398573234f9a19
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 19384 bytes
SHA-256: fbb596b71d8bdd8abc15206cb27f94aa3c267e67224bbfd806fcb00a4c430236

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