Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9da2f3681b72295…

MALICIOUS

PDF

76.4 KB Created: 2021-06-28 11:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 085081f06dcd22a326532976fcc64398 SHA-1: 3b31361b512c723906293ba2a98008b37f9553d7 SHA-256: d9da2f3681b722952908c39c1f648f1cc23ec1b2a019eb668d70ad549e6c25b0
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Multiple heuristics indicate the PDF is a link farm hosted on compromised WordPress sites, with many distinct hosts and disposable domains. The embedded URLs, such as the one pointing to 'parkgest.ch', are likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bca7e5d23ed---36598740041.pdf In PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7e7dbba3eb95c45dc28fad769401073a/bupufogoxebutojarevixado.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/51304756733.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/70070966023.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/9rd728c8alsad5ldddvd7ok794/wobogifefinajowese.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accf16eb6ef---34047918295.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed36e12a6---napisojukowesuwosip.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/tewutedaroletuwibej.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/94293907006.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/bfsi94hq2ien0466quhuve3hvf/32457351841.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/11632467650.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/84767699723.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/31119540624.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/pinonisab.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878f15a7343---sujapexap.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/98398062548.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1412c4c59---degulazokomu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281030201476.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/e224e5577ac21919e5cabbdc9cc0a4a7/69978144341.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/roxilejifok.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/23578775414.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/0d2ab90a173b8be1caa0cfc0e080d645/90339163645.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/14138236635.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bfc3aa3f53e---vevozomapufosuge.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/77086741560a8e188ee2b0.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/figokakura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=usd+million+to+inrPDF 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_off0000c78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 17544 bytes
SHA-256: b0686cc9237d0e9f9856c61cf0dc3e3e1e76c6177bf4bbab9fa4481a40909fd6
font_02_sfnt_off00010dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCF 10124 bytes
SHA-256: 544677f29c20840c6bcd8ef9232f03292d192e2a3f50112636194c189faf0cf8

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