Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcdf73fda3bc8f8…

MALICIOUS

PDF

77.0 KB Created: 2021-09-01 17:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7547f3eed6f2af443d94455446951b36 SHA-1: 9a65c3d0edfd152b81f6b0181b4d4b684234100d SHA-256: 3dcdf73fda3bc8f8ddffa0494cd0f1b26151e4564cee54805f8f7e403d19b449
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised websites, indicating a phishing or redirection attempt. The presence of multiple links to WordPress upload directories suggests a tactic to host malicious files on seemingly legitimate but compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/dcfb4f6fe5343928cc1fde3432072e6f/vopivonawelolasafomepa.pdf In PDF document text
    • http://fairway.cc/images/blog//file/xopixebiwenuxonilexe.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9df722742---sapuwumomusamenutimulebes.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/jirulowidupuliva.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/02b00fad10a5633a6046f3231b3bdf0e/komaregofixivarexefoxule.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/kelaf.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/24461002466.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/pivibe.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/mivigavuj.pdfIn PDF document text
    • https://vestol.bg/files/file/wabipuwizorumakexoxejojig.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/741f9ac46379703273fd9727a10c8194/2332627393.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107090750163432.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/25096722144.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/wekanokepivetojefojagi.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/310507113172.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/razipubolij.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cd5578ef94c1ad68638880e08e1535a4/48884247356.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/69307677299.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/64219598659.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8960ac678---24445277767.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607517f310c19---sazexazejuwojobetemo.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/wiwuperaludebisixexe.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/bakexitamozajekunifumob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+gain+focus+warframePDF 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_off0000c7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 17124 bytes
SHA-256: 8f35536dfd2228b6d6eb320fba9996b5ffe73343d0a9a7922e970037cd752bfc
font_01_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 10808 bytes
SHA-256: 3da196a4fd78ff3a9906dc412cce05aef848aeb3cf680e6090f606170d16d2df
font_02_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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