Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bdf99a4ef75720…

MALICIOUS

PDF

83.9 KB Created: 2021-09-15 20:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a32b08e340066e0081a6361d71851efe SHA-1: eb5390cad848be3162caa88b0517ceabb16bbab0 SHA-256: 35bdf99a4ef75720b65597c2d331803a6f010415b2b58802a40dd35c6c2bd3e6
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malware. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lso-msm.fr/userfiles/file/2357235971.pdf In PDF document text
    • http://tiszaikaland.hu/upload/file/zubegesa.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/96920639566.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/38794511877.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/43083439571.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f864137a8---16397511026.pdfIn PDF document text
    • http://lex.tj/img/file/35496715049.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140f96a6a758---butiwurokoxegulovabezug.pdfIn PDF document text
    • http://jcpingie.be/public/files/buruxivepibonorike.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/geragoneturakinonelel.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631686427koxaxa.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161318b8382a59---xutinoxovagalono.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/16080485755.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/dadifizagosawaz.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/dilurakaresuwasum.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/bozef.pdfIn PDF document text
    • http://primaneighbors.com/userimages/51936058398.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/71725032830.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/39278297081.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/88035451929.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/58262895599.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/59590030022.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/14835321196.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/manikutokidezabex.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/60249339648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+root+apk+for+android+10PDF 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_off0000e270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 18136 bytes
SHA-256: df5a0a71f1538111a9090064aa9013d28115c177b3d2cdaafc17725608dd2ec0
font_01_sfnt_off000110fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 10764 bytes
SHA-256: 10a841724973bc1bbbe6e86809b822a93e7d9ade4b43905f5506709d60229199
font_02_sfnt_off000129f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1