Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9551852ea3f693…

MALICIOUS

PDF

67.8 KB Created: 2021-09-05 15:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 74bd2ffe4113a66da0b29140e6858732 SHA-1: e248af725edd0cb392e45fb543f62ed94e9c0852 SHA-256: 9e9551852ea3f693ac5b4f7b8cbd5b71e475f58fb5e1f379beae73534dae9f39
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, some of which are compromised WordPress upload directories. The presence of multiple links on potentially disposable or compromised hosting suggests an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier clean score 0.2445

Heuristics 5

  • 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
  • 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://amitadevnani.com/userfiles/file/waser.pdf In PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1303e7adc---pinirejetop.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/xinimavulizifamirelulobi.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/kevulitatu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37e149af1a---xamukulerapenuvoj.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/94294534452.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/sajimaxilita.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e860a2764472ae2c73ee2037159a512d/86933565535.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/38282740734.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1343c2e26---58882291116.pdfIn PDF document text
    • http://domplus.su/userfiles/files/zubukuz.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/4536536123.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/zoviwetufosidoviwe.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8potpd421hlabj75an2hn4tkda/91535769788.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/6a98571ab1633b8e84295253009bd90b/zuwuximus.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/razivivokubif.pdfIn PDF document text
    • http://camwater.org/media/files/xevuvukunurixulawokaj.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/e8400g39ufu980ie8crkm0lhq0/jadobezemumuzaf.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7m8flmorjdtlfbfl8sta85dk71/xureto.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608998c6d5f8a---91777978521.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/sivotomibisefu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/98c30e81f8b32dabc9d379e05f2c571c/budidifazekesilatu.pdfIn PDF document text
    • http://vanhacollection.com/images/files/tajubotolonanegasikijexev.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/17085924904.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2a3bf7a015e5ed967775dc96be3a71a7/14442608782.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/64c32b0e50d7d977e2e5bc890522a255/zunufetodebeduvuzujuwojem.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b0913d8f50ca0be707ee1c1d27b78a7c/xifazegoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=foxit+rotate+pdf+permanentlyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 10684 bytes
SHA-256: 17395826617bbbee419b63552e218eef67abfefb3d069d93b7b2ecbff9b50676