Malicious PDF — malware analysis report

Static analysis result for SHA-256 af48ceccbbf7d260…

MALICIOUS

PDF

76.6 KB Created: 2021-09-11 21:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b06351eaad9da6f2fa6e33a9983a9832 SHA-1: ad2dce80811af26f955f8491816400049346556c SHA-256: af48ceccbbf7d2607b411b83930d966bf7f7793444b34810820bb5502ea5b1d7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://acrgruppe.de/userfiles/file/gorujifovofil.pdf In PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/78926996259.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/53275665538.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/58626338493.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/madozamigobotu.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/zidopizax.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/66280769691.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/dotebudij.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/xiwuwudamawojuguta.pdfIn PDF document text
    • http://precisao.net/files/files/kovizuxorawarinalife.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/29970440018.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/q71hddlblru6s0ec4elj28sog7/55565592958.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/58609303718.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136936c63334---1376719273.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/14b1894bf1e8ab8158f95d66fbd1c277/66364524077.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/71829234288.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/dasezenewakixekijize.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/16939055057.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210902_38C77CD237C9B21A.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/63779571989.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/81344055375.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/64562013398.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/86843410406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=connect+windows+10+to+android+phonePDF 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_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 10856 bytes
SHA-256: fb42b621e02502188d4a05621e06b78a37fdf0f2d5dc5dddb37c71ef8ac887a2
font_01_sfnt_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 17720 bytes
SHA-256: 2936c9bbe2c1460cb67735e6b5bd587abe9460954c8248f2a8bd0efc955029c9