Malicious PDF — malware analysis report

Static analysis result for SHA-256 646d6add472eb220…

MALICIOUS

PDF

104.9 KB Created: 2021-07-20 10:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: bc8979cc74f8fc2449a26c883fd75096 SHA-1: 0b23078b7af0cf70c4c7eea04dfd7e4f8a7db2c0 SHA-256: 646d6add472eb2209bead5488440cb9c8685d76fe4e7a45bff42616cc1cf856d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple external websites, many of which are hosted on compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be social engineering via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zekomiri.pdf In PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcaf58c594---32115962976.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/nafekizonuf.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/74246091177.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/885aa028f241e37c7dbf0a4c5d454265/jarakifivitajabapu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714dc0b71f2---memozidepifofa.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/natibokuraberigidofafaber.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce727b5900---kuniba.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/6374531407.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/surabaribulod.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/lakakexowa.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/cb086fe5a8e3fa60d7356642328d9df4/zodikoxubetidujujevan.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ce8b106d85aa5703f09b5984b0a86fd0/nizaw.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/q5tbcll782gnpcq08896lrr5c7/50433044783.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/73408000729.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2efc438815---54673587471.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8945c26e22---46104958225.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/cadad157180fb44a14c6da8a40468485/80826461138.pdfIn PDF document text
    • https://landi-bg.com/images/file/91155768991.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd52c5b7621---6861506595.pdfIn PDF document text
    • http://fygl.net/uploads/file/090756463346.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1b4bd7096---xerogifatobasaliwova.pdfIn PDF document text
    • http://benetalent.com/upload/files/wagakuxeregafojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+does+the+abbreviation+tr+meanPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 20944 bytes
SHA-256: dcac4ab6269e40fe2c58d156b631d2fd14cafe2dc42773d1c9425039fb46e504
font_01_sfnt_off00013a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5F 3204 bytes
SHA-256: e10c934ca52ac3d1a29c5e6dd64d4898a083605950384ead0581a8cc8956c9b5
font_02_sfnt_off000146fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0D 17808 bytes
SHA-256: 6ffb6ac3ae6768931eeda18612dc95409dc543b1bf2178f1dba9ac2080c9f516
font_04_sfnt_off00017af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF4 10668 bytes
SHA-256: bd82228a3e9c2f82d4e4ceacebaa0bf760978d967f8ac2ff0fff1deaa509d536

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