Malicious PDF — malware analysis report

Static analysis result for SHA-256 040e1684f7e13e89…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 23:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52588135ecffc0c453c0a6e231c5aa46 SHA-1: 9ba9954e63086400eaf35e4c04c9ed76b9744aa3 SHA-256: 040e1684f7e13e89a80fe9c245b0296a5d9af9126283ff151699e6b675f6d82c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the link farm nature is evident from the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f01ecff43801c8b908729ddb63bc0e2f/gelipurugovunifadarapu.pdf In PDF document text
    • http://nakajima-ya.com/upload/save_image/files/jajive.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b45d3cf95---piduzagekegegexowew.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/nakemivugarifip.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b1c6acd3a---90824720177.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/takowidufol.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608352ebd3241---61014213713.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160860acc37b7f---94963678034.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/78946298048.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/libokinet.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/xezorubebigusopesalenodof.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d26067803729ffb3ece4d5775a20a948/wigoradadesaruraneja.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/zabedo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ee181ee3691ce975faad7f61baaff66d/zezez.pdfIn PDF document text
    • http://poliinc.com/upload/files/bekaviwivolosumubukukumiv.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/46059968941.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ea65c426b31322d42198d3e9955b02ae/40200747682.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/c8p1jvhcnkblgp8pn9kedr44in/kobajominavuxifatevomubu.pdfIn PDF document text
    • http://bamila.vn/luutru/files/piwubimafizexekesutifamij.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/bazegawejoziz.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog//file/43297326397.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/wukidapejamuwowovoj.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0a862dc07ab0a1357982fd22a3426850/70222403186.pdfIn PDF document text
    • https://flomogroup.com/upload/files/betubozimisixasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=manualidades+con+botellas+plasticas+recicladasPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 18164 bytes
SHA-256: 1ece61e2ab951062f29bd8139bae6cf785d552aa1b76d43119a933ae6f99046e
font_01_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 10740 bytes
SHA-256: 6520056973420052c835cbdc8de27dec53802d177461563aeb1882d918bc6e6c
font_02_sfnt_off0001243b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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