Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2dc2a51f0a6027…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 23:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce841248517a7191f04bc12d31926efa SHA-1: 94049521324c8b9d649f1c99dbd697a4538906f2 SHA-256: 4b2dc2a51f0a6027c090c08b864e48b29f0446631fbdc22a32768c88ef0c0fd7
174 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, pointing to various compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and compromised CMS upload links strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5192

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=power+factor+correction+calculations+pdf PDF link annotation
    • http://patriabrno.cz/userfiles/files/patijefufuxewe.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/xekilosiduraxixo.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/69d6c1f128be4ff59e89eb2212f1defc/bevakixusadiguwonun.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/pispvhbn28kposk84mnj2uk0a5/waduvi.pdfIn PDF document text
    • https://eclearusa.com/images/file/katiz.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/madp2vnnlpcpvbf618i9qifes4/gususivinaj.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/52667259335.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/95940332430.pdfIn PDF document text
    • http://www.siposferenc.hu/html/33284781542.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/14145873228.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/66984086324.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/80084934442.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/papavolufarebijajag.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24581051020.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/vozegadomi.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758137409ae---lijukene.pdfPDF link annotation
    • http://uniradioweb.info/userfiles/files/tavedemakebobelitexotesi.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/61902650261.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4it76am5atr5jf0sttnpafu1s4/gemilowerudepes.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160798a123508f---22704215547.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894c70a02bb---jabukekoxelalivemafexalij.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160949b7b0a82a---gavomomagopazix.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/32256694643.pdfIn 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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 17812 bytes
SHA-256: a14d1e96cb039940df434fa5e63d683b81916d346f122ad69af1288d54d41376
font_02_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 10800 bytes
SHA-256: 2c877f00be229ad1462bb52167e34fcd4a32d66cd670b73b44950d065bfc34c9