Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24ffee600bb43ee…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 20:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 110da83ed73ca37656c006c5f54a8135 SHA-1: 86c4a28654be6db43efffc2fd31d92010fbc3ad6 SHA-256: c24ffee600bb43eed68cc8368241b30727042fe91382a8a311a093059d112bb0
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and does not provide clear instructions, but the heuristic firings and numerous URLs are sufficient evidence of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://etcpremium.com/userfiles/files/wudulim.pdf In PDF document text
    • http://backupcenters.com/userfiles/file/30321457861.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/sofani.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/38158399238.pdfIn PDF document text
    • http://evola.it/userfiles/files/bamubepogogubajesa.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/40273167971.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa0774144---xosepozupexidik.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2dd74e0a08f3641f785fb98b94a0535a/82144319513.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/mabilididaji.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/pizetaki.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/zekolivagoweto.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/42603413613.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/16493630159.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/filunu.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109121454029811.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/17996265719.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e39b899850---xawidoburujogej.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/65259487068.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/buxenutedilozobewaworov.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/sazasanolaxa.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/gonumisedujavepunomele.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/4735310538.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/2545245148.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3100258c0cd9057fbfd675f1b122b803/zubos.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/17291620428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kdrama+website+freePDF 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_off0000ba3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 10464 bytes
SHA-256: f0c242313d7b2513d321dddedf42222e3bc25f7bd1a4ea1f229489fb897bf1cf
font_02_sfnt_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 15376 bytes
SHA-256: 4f8e2075fe3e97f01359157f3b6df29ae8ec1e58184694b3210ae71b9f83718a

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