Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e4550dd8930bfa…

MALICIOUS

PDF

86.2 KB Created: 2021-09-03 13:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a4b512496e214d72f73f427511137b77 SHA-1: 8c9a70e118b5dd5f3aeed13f925fa0a8538b306f SHA-256: 80e4550dd8930bfa2df9f209a355a82f3c7a7cd614f7f52edaef81a0220281d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to various websites, many of which appear to be part of a link farm hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://irlanc.ru/uplcv?utm_term=virial+theorem+quantum+mechanics+pdf PDF link annotation
    • http://pzhjintai.com/upload/files/48225024296.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/tutonulufolin.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3389ae605---rosidivevoxijunesekol.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/rodulubemojituvo.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9291252c521775630d7c117cdf4e4b35/91957769357.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/lovidomekaxalalofed.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/tusubenezap.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160865fd4b888a---refumenud.pdfIn PDF document text
    • http://ooobelkom.ru/ckfinder/userfiles/files/soketaril.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160971f357cb78---rodigiruv.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/wodegapatuderodexome.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161041e59e5adc---ziret.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/madezetan.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/wedejakikomiselupodix.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c090e4225bf---24249658190.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/gemurufusesap.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0d12654a52536daedfdd06a3d70b7fd6/33884571180.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e4fe99a330673e2f905404226fdd5c65/1199470445.pdfIn PDF document text
    • http://juha.be/_files/file/kizebenugiwe.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/3782284f95824458979f367679e673c1/36978286134.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/55546242734.pdfIn PDF document text
    • http://93564497.com/userfiles/89445123292.pdfIn PDF document text
    • 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_off0000e605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 11100 bytes
SHA-256: 2584709492a4c086380fcaccc83584fc9921a45150a617b53892d72fda08de10
font_01_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001179b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179B 19916 bytes
SHA-256: 982133413dfc6660a9c70a2f0882932aec3413aeb1e9a880e36ef98f2cb545aa

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