Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a04cd784b71d774…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 13:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40cd14dd5c7a715bee7a0d68212760a4 SHA-1: 70e33041ad07d1ecc35cd099377c236c252c0cc6 SHA-256: 5a04cd784b71d774d23508c08b03de15e18462e315842fef27800bbb8590e155
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external sites, some hosted on compromised WordPress installations, suggesting an attempt to direct users to malicious content. The 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to decrypt or access a password-protected file, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://pixomot.ru/uplcv?utm_term=tekken+tag+android+iso PDF link annotation
    • https://giorgiosantinelli.it/file/refazilowedurew.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/16479347303.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e4f71468f9f581ce7110e1a448f7a3e4/rifedajotoxakusoxofesemol.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614406ce4d5cd---84599441543.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/lijegejetiseru.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/5835593355.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1276b8c7c---bigaxodudij.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/21896359169.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-13/20210913081913870475.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/30504039263.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/lixonaleno.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/8574607573.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/vimiduxi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9e4dcec9---batepebagowegi.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336ee60a3ab---1200379306.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/99766877651.pdfIn PDF document text
    • https://arerp.kr/data/file///82302640282.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/mosokesuzevenunar.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/12270740265.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/dusabunesupafelisam.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/20/95694934559.pdfIn PDF document text
    • https://gornjastubica.hr/files/10559726359.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/givefokov.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/tenam.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/movixixiredugirora.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/daduzimobiromor.pdfIn PDF document text
    • 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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 10432 bytes
SHA-256: c60ce3964024800ae89b4f9791a6396adc12e9e6d7dd141df5ae3d1701c885ae
font_02_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 17520 bytes
SHA-256: b1ae583a024a0a024d66a839d92475960eecbd15effaf4e300f5d19600e4a408

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