Malicious PDF — malware analysis report

Static analysis result for SHA-256 1371993762913005…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 20:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ebd6d9bd945eae00e047252887d446f SHA-1: ea9417c92df91121bfd2d43ba4f519e5d62f2a93 SHA-256: 1371993762913005b90bb3fa640ca01ae6a50b0072c7262307631d43bc71b5f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ggmtc.net/userfiles/files/85709478829.pdf In PDF document text
    • http://jumpinfit.it/userfiles/files/13247547730.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/pirizoxajafigipane.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de980da36e---fowiberafasubag.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/24365945318.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def62b31363---nediligebofagup.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5946cbd23---sebik.pdfIn PDF document text
    • https://landi-bg.com/images/file/21854104748.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c0394480c732720645d2b69e5b4a31a6/69819492742.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c65904c976---mepuvovinizenimidum.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/kunedanutegijirus.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/18111605614.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/c4889ea96053dadd8d274c5c1bcad798/63994908448.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/xujaxumojusojilitul.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zugozafafazonof.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/rqqe7m6dl5d2aade5310ocltu7/26960007914.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53b6520dcb---fonimas.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/78127241220.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/virivebokexef.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c3b5da0ea---72532949844.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6faefebf53d3fdcce513ee5175388ce1/wusefadepafafuri.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/36410763708.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa58357bad4---gokapelexaliwubutinuw.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/95880956829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=economic+growth+south+africa+pdfPDF link annotation
    • 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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 18200 bytes
SHA-256: 5d72f903b2be9037cf7c9a9922331c8d9d9fcf543a28447dd1d57e1a8d93dfde
font_02_sfnt_off00012b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B97 11056 bytes
SHA-256: ad68c2099f7d59181419f40cc15910cf42eb0cd22201252ccde5d60e4c4db5dd

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