Malicious PDF — malware analysis report

Static analysis result for SHA-256 51442e720950dd67…

MALICIOUS

PDF

87.4 KB Created: 2021-09-12 17:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e2158f94959f0e2ed8c15fec79791f3 SHA-1: e1a0d459a6650bf56cdbfb5fc94eb91b0a3cacc8 SHA-256: 51442e720950dd679eb4febfec8bde7ce5f3da33bee5bcfb97007f1eb71b4c20
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4722

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://synerhu.ru/uplcv?utm_term=sonic+dimensions+android+apk
    • http://chi-kara.net/Upload/files/wibuvizezaxidaru.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5946f1d6a6b633a2f28d9ea32c4cddce/33452326069.pdf
    • http://naoshima-tours.com/images/blog/file/30860741573.pdf
    • https://aviseco.ro/userfiles/file/tewuwepaniwimujapagaturi.pdf
    • https://aartipalette.com/userfiles/file/96186761046.pdf
    • http://chuanghuilaw.com/filespath/files/20210910105232.pdf
    • https://hahapediatric.com/uploads/files/202109081554411466.pdf
    • http://archinfo.ru/uploads/file/dasapifelidujukogaxul.pdf
    • https://sausalito.com/wysiwygfiles/file/36060097196.pdf
    • http://sincaremedicaltour.com/js/upload/90312507560.pdf
    • http://way-of-spirit.ru/upload/file/gubawi.pdf
    • http://www.derbysignandgraphics.com/uploads/file/gosiwatuzukuzogodaja.pdf
    • http://voijin.com/userfiles/files/waxibirixegaj.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34024716421.pdf
    • https://peusch.lu/userfiles/files/fosamo.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613003fc01db9---gowemudezim.pdf
    • https://balajihighfields.in/userfiles/file/94909420263.pdf
    • http://vakaruinzinerija.lt/userfiles/file/72229213115.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b903337320---gejajo.pdf
    • http://fasson.vip/images/editor/files/jezekesedotegeluxete.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6a3357599e4c40c1ddeac7a8577d501d/24401849236.pdf
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/96758352121.pdf
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/93275650745.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 16792 bytes
font_01_sfnt_off0001263c.bin
bce4a9ecb090540294ac3ad085cbdaf3854466cffafce07842fced5edac23d26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 23268 bytes

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