Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf22874539bf682…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 17:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0206958c32e742feace268f57fcc38b SHA-1: e0d421769ccabae2adb43a00188cd24469973672 SHA-256: 9bf22874539bf68233d67a59801f9af72f72c1dda930488ec630af9da87b8338
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL patterns are sufficient to infer a malicious link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=restricted+profile+android+phone PDF link annotation
    • http://familiegravesen.dk/ckfinder/userfiles/files/wuwis.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/pukupewofotapunuliw.pdfIn PDF document text
    • http://fitviewer.de/files/file/buxixugudobum.pdfIn PDF document text
    • http://planbmedia.hu/files/dowatu.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/sojezifopewivewoda.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/35757609378.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/lavesejejafinuk.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e751e85792---96893251758.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/newenapupikazufokuna.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/66533917338.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/fuwavoxulotawapijime.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/81e00f0310c5c5e024b9a5eb7c2a88eb/morekilererovo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161377181652c9---rijaselareda.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/xewasikasa.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/613360525.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/33319572667.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/91527100464.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/80045077905.pdfIn PDF document text
    • https://chptravel.ir/data/file/xaviwivufel.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/risakurumulitep.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/94844015718.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/gisosa.pdfIn PDF document text
    • https://tarsiman.ee/files/file/95542109619.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/55759032558.pdfIn PDF document text
    • http://ukrfirework.com/images/file/35211698492.pdfIn PDF document text
    • 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_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 17620 bytes
SHA-256: 5e25881f18570623cc4a18f56e97df7d5c49a2f05140ae4eea6a95cb74998a0d
font_01_sfnt_off000114d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D4 10760 bytes
SHA-256: e774feb6c666b5f9aed23ca10ae8e4a82fa53b4271bb1b46596c5e151b6e7102
font_02_sfnt_off00012d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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