Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f56fe9bc37fb234…

MALICIOUS

PDF

66.3 KB Created: 2021-09-19 05:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2039f504965bac8b23231048dde4154a SHA-1: 6d613984995258174538236b415f0d27cfe519b6 SHA-256: 2f56fe9bc37fb23400620352ead1c89219a6085924fed2357c5d2833ad7dad89
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

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://philabc.ru/uplcv?utm_term=meaning+of+nfc+on+phones PDF link annotation
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/98l58482hhhnv0fjf8lb2es9ck/60264326836.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/ginukakowova.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/85432825882.pdfIn PDF document text
    • http://e-district.org/userfiles/file/fixokasilik.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c37aa44d7b---dulax.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/taregu.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/bunewabitelom.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/38593582380.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/razomom.pdfIn PDF document text
    • http://bjjiffy.com/upload/veruxekulinewidunizisomiz.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/tolumaruwokafijovemi.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/39559714797.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/41660917436.pdfIn PDF document text
    • https://nexapos.com/upload/files/kegesol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348fe71470d---kodukofatugegadavad.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/38455789398.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210909014910447.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/u5hsnqe8tm65244jd43ibhrr77/12950060037.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/9209882268.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109141259231223.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/33406903533.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2d54e398---21606900797.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/11164392035.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_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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