Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2322c894d17fcc…

MALICIOUS

PDF

88.9 KB Created: 2021-07-05 12:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dd6540bc36967c93b7a4acdaeee2b0e0 SHA-1: 0d0ee105fdd6dc12b2c30e44a012aa4af7ff8f66 SHA-256: 1c2322c894d17fcced366c1c9ef38841ffa3ab18cccceec41d3537bc7ded0dd2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it could be used to exploit vulnerabilities or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://iworking.vn/uploads/files/sataleb.pdf In PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://juhaszautovill.hu/userfiles/file/82503281988.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/dufibuwigirepe.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0988c57b7---45395255321.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vhgo2oot2lbsvop7153lm94nqv/75041343348.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/50b6oegnlc836rtjubtli0ce46/zisubafaxaxomosajodez.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/48165648492.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789ae8db5e5---lowexatixekarogonomewuzu.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/lolokugudibefoximisa.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/72031746316.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf5da15b4d---taraviwuxivawuzowabawav.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/98832448997.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/cc991c92a2feb516cbd7fb9d9df57c78/98192228808.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2ul6n2uvq9t585lid4mq716ja0/24106671815.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607acab859dce---lijupixeka.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///bovufojiguxatonegevofijip.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/75518177861.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/d5e9edbb6adb44a1c0fca34fb556bf6f/tiritir.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/fikinemevifazodiwupuf.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/90116862365.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093959861787---velijiwapefiwebeziwixipep.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a26e02e13---weresuduperagetawij.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080e07890acf---64970190519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=formal+engineering+report+examplePDF 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_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 10504 bytes
SHA-256: 5742d520bd649a757a4fc94abee0b53d4d3f898762448bcca01af08d7df5463c
font_01_sfnt_off00010ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 17632 bytes
SHA-256: 60c73124ba6436428d64f91b746cc510ad4d1e728b5a77f77ff996280f19f50b

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