Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3897aadd52b7c82…

MALICIOUS

PDF

105.1 KB Created: 2021-07-21 03:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e6c1bb4d0aa288f781f798962907e809 SHA-1: fe7780c60b88871bf8c686b0f425135ccf6f7782 SHA-256: b3897aadd52b7c82c4185f4266a8246f7a028956d5f1c9288dfd5355c4ace8b7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely contains instructions to download a password-protected archive, a common tactic to evade security controls. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://capital96.com/userfiles/file/wuzovawi.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/912fbea006b659e29bc7ee76a5926d24/lirokotimimixididerud.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/e97d3p3mnmh6l1jcd33rnj7knp/zinetozor.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/becdf4c5eb458791cd1b9c35f7193796/vafabomosizimutezo.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/cr0jpqhcmbt624g0hn22sj3t20/jobisenureku.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1fd4d5905---32566836019.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/sanit.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/a1e34cfbffceb6ca7854d67ed9f80e93/8085411901.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/46db756c193686bc3d42daa885131743/67654041408.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/69422721289.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/71205652743.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1344f268e2135ec532489ff549e3c190/vutitidufonuja.pdfIn PDF document text
    • http://esejsc.com/upload/files/99430822363.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/63764394795.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/90144923874.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b6267905e---31904145938.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/65802ae5afbbaf9bad08fdaacb20e677/nekuxavuno.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/vemesel.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/45816603467.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/26293570050.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/jixugabudapedovukeji.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c930566fe0c---jinowilufugoxawogofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=can+you+sell+cars+in+gta+v+onlinePDF 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_off0001375b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375B 17800 bytes
SHA-256: 67ef9d483a072b8e7f6ced81bf0708b0354a2b8dafaee68d1b0178d3e19cd528
font_01_sfnt_off00016621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E38 10716 bytes
SHA-256: 2c85b06b8e7ac63f6edbb8d1caf16284b9a33cb995cb6b132543f42b2b71a856

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