Malicious PDF — malware analysis report

Static analysis result for SHA-256 546fd211e331143c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 09:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a7a77db395094c10ab2d9902590dd07 SHA-1: 23dac3eb19730a234f81e92824e4b8124d30ff7b SHA-256: 546fd211e331143c63d545f0d29519083faa4b0f9d67b4e40b13486420f32bfb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8282

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://allytemp.ru/uplcv?utm_term=manually+install+python+module+ubuntu PDF link annotation
    • http://fairway.cc/images/blog//file/99142049195.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/pamofet.pdfIn PDF document text
    • https://starbox.fr/img/files/ropeluropajetuxelerak.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/gigon.pdfIn PDF document text
    • https://menu2uplus.com/images/file/geravevivi.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/jaranufed.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce6da04cf---rurumivufokilub.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1371d56ab---jijepurowumezuj.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/508cbb02168b849770471e7d34737ab0/zifapewizisinunoz.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/36407312502.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/0lb714cuvjs8k9l5719frs47gc/86345587532.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/82439320182.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/wulidusiwifapuba.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/bojunupunuxojelidedop.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ece99589974e8ee7149806ff8fc5bf05/dizafafefazib.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/27408365471.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/bisenozi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071e90217f0d---pizegawolofumu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071a09b398d2---39944349261.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/97346140176.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/8f06273f16ec79e2684f1a410d92556c/gijojijiwebozanal.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/9e0d5b9d3068fede24627db94c042a47/87358157021.pdfIn PDF document text
    • 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_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 10904 bytes
SHA-256: 506c9bd79b2abe559840517d43bb295dbc6894f9851c943a1ec4fdda499b2ca6

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