Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b4384aa4e737c5…

MALICIOUS

PDF

90.8 KB Created: 2021-07-24 01:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0063114dd7a2ecca20fd650d0aa97233 SHA-1: 434fbf79427904b4788cc49ea523a2d5e36f84e4 SHA-256: b9b4384aa4e737c53f0bdcd780f25bf315510295722cdc40a26dd13a18e4203d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://unique.global/wp-content/plugins/super-forms/uploads/php/files/293180d5db7ea64537cdb7daedacbeb7/luponodipeziv.pdf In PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/sipogirinutosirelofidufeb.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/jr4qn3klc0v4fopfsntoa2hqj7/99899064725.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d31d0ffc378acf2987f9beb6e614b0e1/73873331218.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc98a64c6cd---80319789041.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/zodojokotibozof.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/997n4d6cqn6h307s0uatepn3hf/98877555957.pdfIn PDF document text
    • http://mopron.ru/upload/files/61905983273.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d38fa1a82a---xirifo.pdfIn PDF document text
    • https://renault-service.com/userfiles/nogateba.pdfIn PDF document text
    • http://bociany.sk/media/file/zakonelomipinozulofasi.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/14783832696.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/27145481866.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/0f9939f60511958e087e021a1d68ad60/79522803337.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ou49u34pta66gmof5dlc2jb425/36902571037.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7799267d4---91715217425.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca348b6186---pogivodawaditetuxovap.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16097efb957f99---raxozug.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b72222008---telefegujipametevajeni.pdfIn PDF document text
    • http://simonide.org/userfiles/file/goguwejak.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5217491b8---96145118406.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/88850786818.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073b89e3fabd---movazibiposamulaw.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/kcnb1fgs59aiaqp2s2d6l108oq/sudobeketazozekade.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88f82078f6---palinakorokadanuximumewip.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/57629629995.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/mozunitedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=5000+english+words+with+urdu+meaning+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 16772 bytes
SHA-256: 89d5dc610812cde8d3b7a8910b356ab4425fb0693bb55ae7435a04745daf490e
font_01_sfnt_off00012a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A98 11288 bytes
SHA-256: 6b0662648941adbec36b62f8a77acc63120785a4ab9ac204e3597a81f684b1cf
font_02_sfnt_off000144c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1