Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f7a30a55fc38ca…

MALICIOUS

PDF

93.1 KB Created: 2021-09-18 07:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e38e9b3a02836f9fca8913b4dec80bdd SHA-1: 29f8f12a2d1840a63fd4e64e49d7bb9053749cfd SHA-256: 95f7a30a55fc38caf6f0493a3fc22cf8a8b247689489832bf5bddefc2727e59a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's intended to lure users into clicking links that likely lead to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=baixar+jogos+via+bluetooth+para+android PDF link annotation
    • https://digbijoynath.in/uploads/userfiles/files/ladagu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138008b4bafa---polojuju.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/natili.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/3481933348.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/86510489179.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/popifevigagerizomowoxiso.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210910110906882.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/nutuni.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/25004285448.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/28514721096.pdfIn PDF document text
    • http://hexindechem.com/upload/files/92424187790.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/jogow.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/66745673476.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/34237831505.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/96cc5c5022d5b8aab1be48523b963390/jiwufibuturaravonigoxiso.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/zodulotagufeliforobomirew.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/384469febab28e44e7ed7da64ef7894e/kufule.pdfIn PDF document text
    • https://nasikampung.info/contents/files/79937411208.pdfIn PDF document text
    • http://www.moyekolodin.com/files/nojirixafij.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/57254031576.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/sibifivo.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/maxibu.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/67887916619.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/3258139e62fb9742ef639ff166044461/47959199936.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/fikaf.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_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 18876 bytes
SHA-256: 38bf0d9c88ed342fc3bf3a80475717df0dbe5a43c4284fc071dc28e129f55409
font_01_sfnt_off00013442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13442 11260 bytes
SHA-256: 7290f25da528453a06d0a087b78b14bda9271897f81f9b41f5fdd76579e52fa5
font_02_sfnt_off00014e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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