Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be905757f813f65…

MALICIOUS

PDF

93.4 KB Created: 2021-06-28 22:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcb27650f2d9f864eca4a7446c29ddb0 SHA-1: 7c06fcf8e58ada7c0fbad42f7efcdb1bb4aabcef SHA-256: 7be905757f813f65d14b35bcfa5df2291a1499fd1ea8c6ccffbc7345b24e7061
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to websites hosted on compromised CMS platforms, specifically WordPress uploads. These links are likely used to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://synerhu.ru/uplcv?utm_term=novels+by+word+count
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5i02o57tao1fphauagoeksg6b1/3322533373.pdf
    • https://evpersoneli.net/ev-personeli/file/49212720000.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/1d1d0cef9a64bbe2f776f783eb110bc9/pariketasewobe.pdf
    • http://ankamet.com/userfiles/file/fifafivel.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51422244da---25706526463.pdf
    • http://clingac.com/d/files/6525689635.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160843ed87579a---tosibapigasuzagulavugif.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160830d6e583d7---linivubugafojuw.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87620356881.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/35501392859.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16097465f7c6fb---55379261061.pdf
    • http://historia-bfured.hu/userfiles/file/8762219665.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/571105514.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdae2db67c9---84925396543.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/6482db464acc8b7a26c6a4168dc488a6/17488718678.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c33c338e7---tizuf.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r2sohi0mepqdc5jb2927d7s8v0/41798653266.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/edd6d025442a05fcac81a5bd284de61f/kikewo.pdf
    • http://daindnc.com/fckeditor/userfiles/file/27772827072.pdf
    • http://vamaconsulting.sk/userfiles/file/49183029364.pdf
    • https://comtraining.cl/userfiles/files/19266829905.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18b7a82cfd---43934137292.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/5981902512453bbba2b673bc1c8ad130/fifitu.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccf875cd28---pemati.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084df083dcc1---694694487.pdf
    • http://ei-windykacja.pl/upload/file/47759393809.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_off00010b2b.bin
e0c115463188dc25d5a02dd2d9231ad7da0894bb3527e8ffbad87dd967b206eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 17400 bytes
font_01_sfnt_off000137d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137D7 16792 bytes
font_02_sfnt_off00014fee.bin
f644a918e1da48de28fd1f5f9f754b258da8f3dea208754a60f0da301f9263e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEE 10592 bytes