Malicious PDF — malware analysis report

Static analysis result for SHA-256 504b918459c1afab…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 13:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 654e54ed49132cb8b5057d04a1b667f5 SHA-1: 2d7655f4e53e22d6f744f539366f3ceb2e2e681a SHA-256: 504b918459c1afab49eb73a17a3923e14a1fb1b1e713edc8ed0d80d8eb9216c8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF acts as a lure, likely for phishing or to download further malicious content.

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 http://donkaew-furniture.com/ckfinder/userfiles/files/pamunopiviwepa.pdf In PDF document text
    • http://bielwod.com/userfiles/file/ludulixafivewetopemerixo.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a45c23f3ed9ea2a3ef1c5b7075950cf5/35975094215.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/nekidij.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/24942555125.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/196e7793d92c270043a0f3c45d36347a/69299685260.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/koveluwimozevupo.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3474c3c606932ef2814dc8992d841296/40251064573.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/pedoxizukukoteseparepe.pdfIn PDF document text
    • http://zeci.nl/im/image/54606163177.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/zepumetafazo.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65f718242cc9643c421357bded58b809/79230253031.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/nioth1d3ts97rv2719c6v13juk/86058507781.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210531_075637.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/63068017985.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/petijunidatumitipumitatup.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a83ba574a---29038161223.pdfIn PDF document text
    • http://ombs.ru/uploads/files/xujap.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210831_B8FD2FF7D3D0D08A.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/21185812682.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/dikufavoxadif.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/mubuke.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/kobebarotejudixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=leg+strength+workout+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/xiduzo.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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 10712 bytes
SHA-256: 51f808c469acb0bf05bc7741eac552bf5b2a85b7c59cbe0c02653b4a9dac3f47
font_01_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDA 18048 bytes
SHA-256: e44a7daf64776957fa75c251d33349cc72ee625bcf7a589f0c437a870a360e9b

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