Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c6568e2b5318aa…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 09:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 539d4935ce7035bc54063e3f61048d12 SHA-1: 25ec1c3e14b0d77774f2642904684f072296439a SHA-256: d3c6568e2b5318aa230651d2c8fd3daf62e3a3a1d85883fb77751f80ef43bf54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://incomsistema.ru/ckfinder/userfiles/files/69260540507.pdf In PDF document text
    • http://mikllc.mn/uploads/files/wotepogutolij.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9d6ee143a---texekiterowudamid.pdfIn PDF document text
    • https://rjpexport.com/files/fivesikelan.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/wukibetewofejavewemexa.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/nisorosin.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/rewibagawuwuvabasuze.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/guwekowofetidetodib.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/87806141534.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419d2e13d40---gonemuza.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/55034993581.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/34481810447.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/67743442814.pdfIn PDF document text
    • http://okvin.org/userfiles/file/pujutarujupiradewewa.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///4632420935.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/9682338010.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/86121040134.pdfIn PDF document text
    • https://harmony.im/userfiles/file/puxafavawowa.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614971fa37360---lolovewifiduvaretot.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/lamofaguwoketebusosa.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/buwiturevorenexon.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/17987391405.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/lowesijezozijabobugotewoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cupcakeria+papa%27s+gamesPDF 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_off0000b1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C5 15996 bytes
SHA-256: 2be7330475dd0bfa03ca714a734f13b0e99f512d702545042975b39ae533f764
font_01_sfnt_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 10604 bytes
SHA-256: ecc1b304c5f80c8472075e2d32d7b0dcb241c783e337bda31563fc6f1b1a7c5c
font_02_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1