Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b46d9dbd940bc03…

MALICIOUS

PDF

81.8 KB Created: 2021-07-07 01:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 499a258ca587a5a6e7d36f07911b5279 SHA-1: fa8aff54f4723b46c41044243ad78735c8acc453 SHA-256: 1b46d9dbd940bc033103759b054790302a8dc6f73c0001a1e96e3c2c54349114
156 Risk Score

Malware Insights

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

The PDF document contains a link farm that directs users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3792807132e8cb3ecf2c2027491db3cf/50941878221.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bbbfc23daae---97763066852.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608a06e801e5e---wusasajunijotuve.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/86af7df225581f7efeb8858c419d53f5/dawozixiseseve.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/76455238069.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/98616361147.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/60897393676.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddc112395f---vowemowerejesugosudoj.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/hlrf6bi0og8hvq1reccu6ejs95/84762372169.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803d9200a95---jetelunune.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/11865905678.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/pibanazawezipuwurak.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/12606698004.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/75426035338.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/98799746979.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/84953439083.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e16413c7508304dd3127e5ed3e2973a0/bonelibud.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c1d8bb42e---derepegenigigi.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///raxebifulujukezemiwojega.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc22654427---xawemunabutupijimunufi.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efdc0cd6ff---vugox.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/25523593707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=50+shades+of+gray+fanfictionPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 17468 bytes
SHA-256: dd56dde3859ab4a9d18360a7255792820d088d05020dacf3935a14a994311069
font_01_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 10984 bytes
SHA-256: 86bb02f2827ee356382354b476923fdb022d63c349336d2a3dee5e1d70983db0
font_02_sfnt_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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