Malicious PDF — malware analysis report

Static analysis result for SHA-256 879841a48f6a0924…

MALICIOUS

PDF

92.8 KB Created: 2021-09-13 11:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e50bb69b375a75dcc5f9c0404b9c00e SHA-1: dd44cc07c2aab928f6eb0f7bb5878a78047f6d44 SHA-256: 879841a48f6a092459566cb16e2ed52305ec55b768d8c036ae66ad8401ac12de
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'SE_QR_LURE' also indicates the document may instruct users to scan a QR code, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=install+gta+san+andreas+ios+free PDF link annotation
    • http://tv-sat.cz/userfiles/file/66310671103.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/88737830414.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/wutav.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/rotobikakafejoxox.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/59631922762.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/jebufupuzepevurelekon.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/vogavedezidemaguti.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337f213eb63---94625899718.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/kamoma.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1a19e1850eaea47a9bd4f7571cc6b44b/98203911619.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/72622622643.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/fikivajit.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/juvufoguwofuwunelolinuj.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/78342583364.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/42446019980.pdfIn PDF document text
    • http://sinoorchids.com/image/file/gumofipajazejakafa.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/59835685576.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/11405181650.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d43085db8---91885052026.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/pawewagugu.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/80660786100.pdfIn PDF document text
    • http://rld-carbon.com/file/mitorotonefunugipema.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/34265652571.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/85792641211.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_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 10480 bytes
SHA-256: 0ee1a2012570ee6516eae2df8a8adae72f07578376e014ecf9774583dc9a9b79
font_01_sfnt_off00011ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE6 17992 bytes
SHA-256: 43c1856d62a900a95d5b4ad13be778a797d2e013bd8d125ec8ce9037f4b54fe7
font_02_sfnt_off00014ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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