Malicious PDF — malware analysis report

Static analysis result for SHA-256 22be463bd3325418…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 11:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3423e572abe6c7234094b24809560a7 SHA-1: 9fdd721406d26d257d021efb70edc1327d1dd9e1 SHA-256: 22be463bd33254187c03360e029657697f9b36fff1da6f055e7a0e23675298e8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially compromised or malicious sites, possibly exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://braveathlete.net/geektic/files/kuvikijeropom.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140f0d90919e---60742694979.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/rodebifotujinojol.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/xikasesamesotaxijal.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130536051338---potizufo.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/jitezalikadagoju.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/62797021088.pdfIn PDF document text
    • https://citytrafik.nu/images/file/wetunag.pdfIn PDF document text
    • http://lejuriste.ru/files/file/tenifilo.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f49cbc931---mazuka.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/38334024866.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/35217252431.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/laxovivap.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376f6267367---kufezarojedane.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/88768734038.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/soforepuzatijuda.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/zezumuwavipofar.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/55433676654.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/98754055048.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/peregakusamisefuwenux.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135168deed53---mevagilaloveroxigi.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/juluronubi.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/56fe712c195c9e17ab96041c704c92f0/rajuredijip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=autocad+activator+2018PDF 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_off0000c475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 10564 bytes
SHA-256: 62a20b03fe62b1deb2c90dd5256ba1381f90f23ad42a7ab14594340c2990419c
font_02_sfnt_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 20516 bytes
SHA-256: 3907f702faacc70d8a4397d0c534e6c082726516c91b2e2f019603e5abafa568

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