Malicious PDF — malware analysis report

Static analysis result for SHA-256 90dc37c43d21b0bf…

MALICIOUS

PDF

62.3 KB Created: 2021-09-17 05:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d37d98d75d37f337fd8c1e3aad090507 SHA-1: bb8359313ea5b776e8f7f331e56d0928d87082e6 SHA-256: 90dc37c43d21b0bf9593796bc3189c8434fdc2f8f2ca1974bcd9178b69926fb0
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb6060551---23132846019.pdf In PDF document text
    • http://japan-railpass.info/images/blog/file/38995708247.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ef560c052bb8a843e9025ad3d77ab6cc/27094468750.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/51477881815.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/fimulo.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/16198359810.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210916185804.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/78261724506.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/xovibuzefufiliborelasok.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/1095312000.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/27224514286.pdfIn PDF document text
    • http://vhshf.de/File/29321702509.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/ravasupudatamiv.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/27209378668.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/zonafaziloraboji.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/78700266568.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142565a203b7---94687236363.pdfIn PDF document text
    • http://master-br.ru/img/file/pumefopovixapobozo.pdfIn PDF document text
    • http://byecook.com/ckupload/files/56589607753.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/77257307530.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/nazukuserununerepevagaf.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/denudesejaxagexunum.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/20493513897.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/bumakidegoti.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/dikipotaduniditomubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=7z+opener+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC299 10088 bytes
SHA-256: 0d2ff54d7fd240c2dd3e6fb7d2d3b5c00114f7e5e47d97a99d6a6588257bd2fb

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