Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8aa1f42788cb7d…

MALICIOUS

PDF

87.3 KB Created: 2021-08-30 00:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 386be60c04520a3bd818f5e85da8be7a SHA-1: a1a90bef732f5914d14eda954a45ea98f5395406 SHA-256: 3f8aa1f42788cb7d4fb5f871a9048fe75ee89d141a7cac86f0864672f9aa455c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to external resources, likely for malicious activities such as credential theft or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7885

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=cost+accounting+a+managerial+emphasis+14th+edition+solution+manual PDF link annotation
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/85d9d4aa79c6ed5fd3f0e05b8782f5d7/59192666323.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/kixezawo.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/xiwobijaga.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/97435693721.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/vusitekaxabojopekasaxi.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/sao7sheil8ceodtd9gfjnjh41p/gewovakurusel.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b7db8358c32849021428d40c5f5ab083/korunipudigonemelojamug.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/cfehr99t0tr6ni7ic73hoi0dk3/14864134819.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f8800522e417bccb7a82276fac5944a0/babikitamabitalamojas.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c3db267fa2d---76353195177.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad9637bebb---89295611895.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/fotepeminusitumaka.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/gefabumesabek.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/21179491806.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/64699832800.pdfIn PDF document text
    • http://licausi.it/userfiles/files/10416012539.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/09df26ad87a8566626890d58177d646a/3859996704.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/nagasezubopiminunifu.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/su2ksop0jtpvv6u2ogoapm2qvj/bunawexeriresufir.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d561932ba4---99729216122.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/41371589709.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1f45b2b348fb9f640f94b9edbf927b8f/71471701263.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94559533338.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 11220 bytes
SHA-256: a673f24e3d7eb9b4673360b310b9ad9032cf37e7d18a153566e907daa14040d7

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