Malicious PDF — malware analysis report

Static analysis result for SHA-256 408fd8bd3b543ec2…

MALICIOUS

PDF

95.1 KB Created: 2021-09-03 21:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36e90d3661aedf43f65f63d934e65e94 SHA-1: 59b3e4ada7eba986fa3df1f8f0b229fd2ea6c9a4 SHA-256: 408fd8bd3b543ec23d79fe14ecce4307d61551350247f61dcff28637d4fae055
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://karapinler.com/calisma2/files/uploads/melixivuzuzenugojeb.pdf In PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c955f70343---59245869723.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c6144c06aed87e76e28f95d40ea4157e/zixesibinedodoreravajup.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/36902357374.pdfIn PDF document text
    • http://imbirimbir.ru/files/62214127051.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3fa57d565c341fe639d84c329d84a462/vubowirukamekurox.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a85903c2ed337245d75b52e7f0093af9/poritok.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/43871766795.pdfIn PDF document text
    • https://bnovum.hu/downloads/93802578841.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0364cce8e---50895440667.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/pisifipemokete.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad2c501ba---82304974142.pdfIn PDF document text
    • http://rurisnet.org/images/file/gokusuwavadabizaxabezu.pdfIn PDF document text
    • https://energooptima.hu/upload/File/81097856855.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a9b8c77d0---fuvupabomadulikifij.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ae1520656---48037753417.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/webikubi.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/57434479742.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/781182c1abf5a03f633681abd9ca5823/2468789379.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8a5319d593d28961eee1606108a7db5b/gijanalujosapo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/nu5oo1bp4ggv3t1jt8js9a9vbs/dibixatafogakabo.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/36615680737.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/92215904810.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/tuxagemegebobofevuzavali.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-29/20210629121724600642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=forty+rabbana+duas+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 10552 bytes
SHA-256: f6b6f7d721d5e959dac785c95f6036d1248d2531e8c89ae1ab6e960134bd776c
font_02_sfnt_off00012773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12773 25540 bytes
SHA-256: 52eaef8b39fc722077ad4cc56f2f7dc32adcb647e4dec2178f3e18d13c738106
font_03_sfnt_off000166a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A7 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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