Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf9de61f42ee69b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 00:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2012ac24a72b0fdc8f5e5ddc64310d70 SHA-1: d320c41a80cf06c45ba9381943138bbb71f0d18c SHA-256: cdf9de61f42ee69b3bd8a826fd101d72ece5cd79ae4baac26a1a2e1e3d350b3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=the+wind+rises+full PDF link annotation
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325a11af44c---65510486097.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161352be2aed9d---xosojokobejagawodewu.pdfIn PDF document text
    • https://techlan.pl/files/file/jagikuzagifesezekal.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/seniti.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/kamigubunilibezamojuzegi.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/49992894897.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/70598601456.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/23761433728.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/dajevezaxipuwobebupiri.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/1729cbd11500d6243524a5d22464ea53/wirigarotopizanijud.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdf7ed84dc---vijirow.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/63023582486.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/13883718691.pdfIn PDF document text
    • https://rintrans.com/files/ponire.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/panezibobekiru.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/60552016075.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/96777421941.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/megepepiviludim.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/guziruw.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/55192246095.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d04e57cbcaa3a3beb65da67176ceac85/bobojunema.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613e762a269c4---34158376404.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/fuguf.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_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 19652 bytes
SHA-256: 0f217f7526fecd83a69933e74e1a3a1e4a11e1f4fd456bdca7e5dbf7606482e9
font_01_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 10220 bytes
SHA-256: e65dbe82997e74bdac7839439838c3a6a30793203bbb105fd8f92ec53eb686f0

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