Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba8fb953df368cd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 07:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f6c0b137333231a074315bd17db26a57 SHA-1: 69535c96ad8ee72ffcc56eec5ce9ea1ec9633b28 SHA-256: 0ba8fb953df368cdcb84bddbe7d5d86dd0cbe0866604f5d0eff6c014f6380217
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and link farms, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=pokemon+tcg+android+requirements PDF link annotation
    • http://chayka-svg.ru/files/41162964705.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/57151976190.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210906210824.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/36640260546.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/85925958637.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ec10f367---bujisipuwasoge.pdfIn PDF document text
    • http://trivio.it/userfiles/files/10039102542.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/jutivotolasisevexaloxusaz.pdfIn PDF document text
    • https://digireg.nz/upload/59600302693.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/84475544905.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/40505795358.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/tixepabada.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/ritej.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210904210132.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109030757349124.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/roxuguranevulotabex.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/fepuxunawejoxovitibevag.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/17857806b43c7f05ceb1ff0134681c4b/jezirozalub.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/26960543043.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/39808356309.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/90948768768.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8788227e7---56235999363.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/gilimisitebofepelipanorap.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/ledupiramosuturezuv.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_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 11008 bytes
SHA-256: 2c89ef760356b7f098c76e45e9b5a141128664f5ff25adab6d17293a5272d46b
font_02_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 17764 bytes
SHA-256: a3f7bd3f5daf0f5fa6fe05ebd7978fe83a71dedf64725af1bf767b4b2c2e17bd

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