Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c0b29e0a5d03e8…

MALICIOUS

PDF

92.5 KB Created: 2021-08-12 01:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c56bc82afe0279b4d3f61c56244acdd SHA-1: a3bc3da4ca4582574549066826996c0e44320104 SHA-256: b1c0b29e0a5d03e809a77478f13587e8cabd8e75b93fcc4e67a779c85823a10b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used for SEO manipulation or to distribute further malware. Although no scripts were directly extracted, the nature of link farms often involves JavaScript to facilitate redirects, hence the T1059.007 technique is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e6afc5d8fac---dajezijuxo.pdf In PDF document text
    • https://digitaldaya.com/imagenes/file/fulekuvukijame.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/81088242251.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/lusajapowakelejalax.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/98421m6cbqqkclp0eu946natn4/85498985164.pdfIn PDF document text
    • http://svx.su/ffile/file/14201954611.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/83667367571.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608051e58865d---voramudubirazod.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/92455594243.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/tamobojoriwokema.pdfIn PDF document text
    • http://corporacionnoa.com/UserFiles/file/96117786886.pdfIn PDF document text
    • https://wsbtitan.com/images/file/situfukizofo.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/21224638749.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/s9hma9g3ak15hi00bogteo6qn1/dolirokom.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/6f697fe4ec224d7d62a0a60ea9eb2295/20569479748.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/96035330866.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/52236221449.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/vofezoxixurene.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/kikiju.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b32db69726e4016cef411cd603692d48/45755754315.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/jusiduvedasasidemapozilis.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/nexepatutevipotetelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fifa+11+plus+italiano+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_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 18780 bytes
SHA-256: e9dffb8799957dafa2cca280e4adcd166b16fb46104229254eff6b2b198107ce
font_01_sfnt_off00013245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5C 10388 bytes
SHA-256: 348522db998eb10d2d1a08f57b2a272fe9a98b31887c078686f294fcd0a68f79

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