Malicious PDF — malware analysis report

Static analysis result for SHA-256 61482640c882ceba…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 10:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f73b4b6f66472af4b50cccc85ff4a807 SHA-1: 44b0ea0315be933480752af97608e1e471758391 SHA-256: 61482640c882ceba7a1b452c951f8449ac393a25fdbc2e36975bdf7675508a5d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to websites hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuwojexupozerimeranexo.pdf In PDF document text
    • http://kaies.cn/upfiles/210706025628198602wsvnuu.pdfIn PDF document text
    • http://olympusflights.com/files/files/xujoguzowuxudiwilepiva.pdfIn PDF document text
    • http://gibisch.org/files/files/8796260535.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/pawudotogavepijezezugekit.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3457fcc3e384e76e5fdac97ac85d4c02/94351205667.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021810344327309.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/40905826200.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ba052f7d0b1f57e69c2a859711ea6b59/30312387760.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/beroxexawewuxulularo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a340823e5d4---58191556045.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/xepowevizatukaxokofoletap.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/25660734263.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/zomaxuru.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/aa9e0b2a44953cd233342b2f9a64c1ba/2620193220.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/suwononifokisixija.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b61a1a9b857---lobenemesozumi.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/kedadodijemegowopudulumi.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0a522674fd8f6cda29b771fac0803fcf/gufekivimofuvefanugo.pdfIn PDF document text
    • http://santabruna.cl/upload/file/88302474943.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/61763264039.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119e0bea95ac---pajodutebapuboketupi.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/wosoxiz.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3f707a9b5a3e11494b626648f3ed3eac/tujijokimoxediwunugoto.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/ludinanozejosipotaraku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=chair+plural+in+englishPDF 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_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 10444 bytes
SHA-256: 9b60a1ed3ae3aa860ce8ed3d875e5a05e7b6662f33cf38300d7875f1671cf7e6
font_01_sfnt_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 19796 bytes
SHA-256: 97ecf6a8701af0c24f80b42d4fb2502be352b7ced415f57a5a4770a641ceecbb
font_02_sfnt_off00011c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1