Malicious PDF — malware analysis report

Static analysis result for SHA-256 9611fcd1ed052ace…

MALICIOUS

PDF

90.2 KB Created: 2021-07-02 01:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8fdaf8edb5443981f276a718ad13d596 SHA-1: 236d3a5d991885afabe3f67ab194a51fc9746bc2 SHA-256: 9611fcd1ed052ace5470405908e73910215a6e503319166c6dfac2e043501938
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c62b54f6f---larasonipajubopelos.pdf In PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/68782844575.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798a6f0d5fa---51851798849.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1e43d774aa597a93630de6d4ecec4b77/wuwipufolefodowukoraxude.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/68948662704.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/884c661ef58230f20a21bd97ade85d52/91899135744.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/ketogafu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d86c3421cd---gawedewutabevaved.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/61069280736.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/05835348fa39cdfe3d8e2193d5710ff4/46479460549.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/mv2n7ld0hpam7lmo0smc6jdoo3/35952085447.pdfIn PDF document text
    • https://kartplast.com/resimler/files/dipegafevukoxanutuvo.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608183959ac04---3476085612.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210607061517.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/kofoponojiwadoborosodefos.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f532a365---xavewolomepuxidaret.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/nabesegekinuluwomup.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28086c531---15454776689.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/45914208164.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/mqp69t66vafugimjp9b5c4lu4g/fikolodalubijiluri.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/9d0c0a149a66007bc479429e62416dd0/52006854571.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b8dec880---vavigipudamefudisa.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb689843ba---jomumigebopazepimutumigag.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56e3f24423---kaboderukuretizebat.pdfIn PDF document text
    • http://surtek.biz/image/files/20150116_233734.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/vuvut.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/xidafotisovajepubesavewiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+permanently+delete+items+in+outlookPDF 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_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 17396 bytes
SHA-256: 1ce37ef383dfa809332100534f872e29583a1b1fb7e4b8063c013c8700e29596
font_01_sfnt_off000129ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D1 10936 bytes
SHA-256: f61be557fbf296b70138acc6576d38b485f6462f966bb8c44369099c9055b5c8

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