Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7efc37b3ce5480…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 14:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bd2b624402f129a64d26f19b6482ec67 SHA-1: 3d74cf2ce02cfb35cd8558cef0e8d67af00c7cc0 SHA-256: 9d7efc37b3ce54801de0fe4ae9386ac6ca899d50e620c497c9ff4a89206010f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs hosted on compromised websites, which is a common tactic for phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0b8e3c7062015147b0a55c2a05a67574/8764847793.pdf In PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e81e33808166ee93e2e0c4a043472f9c/linumovez.pdfIn PDF document text
    • http://klinok-saintp.ru/files/zixeli.pdfIn PDF document text
    • http://laserinnsbruck.com/static/sifar.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/49109307158.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/kokivixix.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/kikotuxij.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5972aafba4---43203483008.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f96efabde0f---mexodumetufawufuleneb.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/wenopagogilelurusifek.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/63264359720.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec2e0d6106---sujesitulasivakepu.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/13776473318.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12821896373.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/navolode.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/xuxogu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/p0s1vi6552d4gjt45pud022uiq/zaluv.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/muzepanixiberizigisidi.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/81313396917.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/96455088361.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160866983501fb---40908863892.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/97439277959.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/gezusoso.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/muduvurekofoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=limiting+and+excess+reactants+worksheet+answersPDF 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_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 11008 bytes
SHA-256: 84ab2b84bd103c090484c57bf8245d679f9f016ea5c92db105bb2127b14dacff
font_01_sfnt_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 16696 bytes
SHA-256: 34996810dc62fd9ea61280724f562d038f4f443482a6e5fd77503332d3757931
font_02_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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