Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5352ca5b9e7ee2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 09:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df59062f25d0a7fa94a31abd3a32896f SHA-1: 0ea32a71729f6edae16fe0317c452ec85ab8aa87 SHA-256: 4f5352ca5b9e7ee28c9cac557c8845f1ec862c6849e711774dd6df704a683add
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aaykpn.com/uploads/editor/files/fonud.pdf In PDF document text
    • https://albizy.com/ckfinder/userfiles/files/79511128055.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/61169606537.pdfIn PDF document text
    • http://palami.by/images/file/41388423476.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/22156202618.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/55538304026.pdfIn PDF document text
    • http://recviem.ru/img/upload/62380086395.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/4a7262df909c3de2a9c895006ac3434a/limisejijuvegedikokunemux.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6fc880275106db0823ff454ef555686d/lifuzamuwig.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113da16db594---zesusodesozititumo.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117cfb369e45---9635444983.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/3509160580.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/l0qf6ihgb15v61kvo8peo8ekcl/nupepupetodetozu.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/30798115841.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/17718495314.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021083003465273499.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/00f9f5386fdbb96d6a8cf3a48f5a22f8/60359304210.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/burarajun.pdfIn PDF document text
    • https://triosms.com/userfiles/file/18911206796.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/321069837.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/24223526629.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b3adcded5d0952728f0e9c649802bdbe/41759093952.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-3/20210803005051407620.pdfIn PDF document text
    • https://securitydm.net/slicice/file/mozinogasakexomuwogibewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=collapse+of+complex+societies+pdfPDF 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_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 19952 bytes
SHA-256: a9dfbe321c09d9c5175b84c9a1d00b6b10351eea8058aa40a302fa1ea27dcf5d
font_02_sfnt_off00012aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAA 10712 bytes
SHA-256: 89501ab623a4334e5fad8d28ae901f73423df19886f1c7297f3aec43d0b2385f

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