Malicious PDF — malware analysis report

Static analysis result for SHA-256 8057af8db19f9e60…

MALICIOUS

PDF

71.7 KB Created: 2021-10-01 20:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08fd6995d709153cd5493b2b1f6f3375 SHA-1: 90fd612a6312f8ee4840f033f55bf6b54faf0453 SHA-256: 8057af8db19f9e60b50d7ccbf3cd0283340daa4c45ea8047f78af054bf868fd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs with 'utm_term=download+ebook+the+power+of+habit' indicate a lure to download content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://wastran.ru/uplcv?utm_term=download+ebook+the+power+of+habit
    • https://baohohoanglong.com/userfiles/file/80921883295.pdf
    • http://luisacortesearchitetto.it/userfiles/files/61722502183.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77152572984.pdf
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/xaluletuliwobupugalebomod.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/nuliliralafun.pdf
    • https://prestinireedcorp.com/userfiles/files/27811438091.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/vudezi.pdf
    • https://ashasuchikala.com/ckfinder/userfiles/files/57472769786.pdf
    • https://granitabrasive.com/editor_up/13742041437.pdf
    • http://tabletopad.com/images/file/7100918507.pdf
    • http://fioredda.com/userfiles/files/dezezeziterodamimu.pdf
    • http://yuh-tarng.com/userfiles/file/75408750791.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615414b770979---kakokenukegalu.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0afe00dbf144d2376c350e2029fa303b/84632788602.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5affe2ad3---28790891777.pdf
    • http://ipayon.com/root/FCKeditor/file/subatadatidatuxuname.pdf
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/wedularex.pdf
    • http://net-marketing.hu/images/files/47781129771.pdf
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/55522281862.pdf
    • http://dcbestwings.com/uploads/files/71376201318.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/v7llgbd6vd6fhqkpfa084tfhjr/xusisaloburudik.pdf
    • http://barahi.com/assets/userfiles/files/kavuzo.pdf
    • https://ajur.rest/uploads/userfiles/file/faxepedelev.pdf
    • http://pol2-simf.ru/userfiles/file/totepojolun.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b506.bin
b726d642e05e7fe6a5f0dff8288d6e03c7a4b9f85dc7beb4f428fd95b7483f21
pdf-font-stream PDF embedded font (sfnt) at offset 0xB506 16380 bytes
font_01_sfnt_off0000ded8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 16792 bytes
font_02_sfnt_off0000f6ef.bin
f4f4618afea587c3d95d1594893da39a1d520ee5f385383498012d70bccc3ea4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 10748 bytes