Malicious PDF — malware analysis report

Static analysis result for SHA-256 4842c5e33e0ea2c4…

MALICIOUS

PDF

85.6 KB Created: 2021-07-13 22:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa4304ab7f38f6257f490e1e4c464149 SHA-1: 52c8592e6262946dcfbbf5c4c7cf579bf11ca225 SHA-256: 4842c5e33e0ea2c4e45b4974b10037ee116ec33f4ba1b1c19600f9eec00dcc7d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The primary attack pattern involves luring users to external sites through a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://stattus.com/assets/file/67688026804.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c161275b2e9---sepewiluzupiwoxovalagobin.pdfIn PDF document text
    • http://demkapi.com/resimler/files/pupiroz.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085b28328852---33733011894.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/34218039348.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/jowezixojulitoruzu.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7824b80c9738a3dda19062169f5818f9/limebi.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/monuxexutagosipezebelix.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/6vqq2mk6qo6mk7ebah1amoq7j5/josabiniwibifobuwukonudu.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b49385a6---bekukegesukaxisif.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/p3b7jp6btt0041cibgqdrom435/begurevibezopudir.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/20550600137.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/isknkfob6f8lhbk6039hdqrjs5/42889138860.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608718c88e01b---romozopimudipulumonofom.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/cd0d669ef1bb3c470424bf132bd84b96/95055999192.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823f6b17326---riburesobiribuke.pdfIn PDF document text
    • http://capital96.com/userfiles/file/xetepajetasubonazuru.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/ketifipumujutikazutibepob.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/jofirukokivosumu.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/20882219565.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/27529828271.pdfIn PDF document text
    • https://etadelloro.it/images/file/rilobotapuwekikasun.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b51dbcfe---11545345126.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/noxikekovafepidofemirajuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=love+god+love+yourself+love+othersPDF 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_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 17584 bytes
SHA-256: 2a1cfa81c20dda5334d9121c78f82910cec69d90e624a761e2c0e20901579d6e
font_01_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 10512 bytes
SHA-256: 6b79b274b115384180ba14f952992ada972a952a670287052930ee87eaf1c6a6
font_02_sfnt_off00013138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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