Malicious PDF — malware analysis report

Static analysis result for SHA-256 68525abace3efce0…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 04:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8e1065eb1079540531d61e5b95e5c40 SHA-1: 4a288a9a42db4d7a8309ac5f1ff8b0af993d17d2 SHA-256: 68525abace3efce03a9e02d12a5e842b29d6ba9c46ed2a7eb636e8c8453f7bdb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The ClamAV detection further supports its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://vandientuchinhhang.com/upload/files/95163150338.pdf In PDF document text
    • https://indobaliart.com/sitefiles/file/74393543405.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/93067674913.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/12886924264.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/35519649055.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109021246461163.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/nukijat.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135054b653a3---41751676220.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/j6vs330sj95jq1cgq54sfrtj98/kukutezuruwaxovivovazur.pdfIn PDF document text
    • http://potlista.com/file/files/ketapozepuponekaxo.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/46065201359.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/sanezodivimavepefu.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/jimuwobigawore.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/merakubivuku.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaedbe4002---25895186750.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/k6cqdd9t0or2mrul8jqc3vthhu/nomonuxarapipazataje.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/97363328732.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/lojofedisifenebekefi.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/veduvanebij.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/28582400738.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/11028956515.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/wawedugonovoxopukeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=minecraft+pe+apk+versionPDF 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_off0000b854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD066 15816 bytes
SHA-256: 55f98341ac317e033679ffbc29ca165b6919406cc95a7d484020a03a7d8654d0
font_02_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 10580 bytes
SHA-256: 064b50c20c9173e3094e6f30a8d9e097b1349cbf3c26fa69e718f1e4de2cde99