Malicious PDF — malware analysis report

Static analysis result for SHA-256 121dc99c910b0d0c…

MALICIOUS

PDF

82.1 KB Created: 2021-06-25 13:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcdb10a2e370da441db9aba145ecf601 SHA-1: ba805b91927b9d698f39eeb3eebf4787c83d2de5 SHA-256: 121dc99c910b0d0c2de03f1ccd9b9c5c4c494e7992081344792eaa81421056ef
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting PDF files. These links are likely intended to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a914f062---turet.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9eac54fd352a47fc3bc77fbed3804dc2/71030012365.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9776969586df629c4fc7eb580db250d5/71833837619.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160764c476a7a7---wiwukojosufa.pdf
    • http://quatanggiabao.com/images/uploads/files/63072816731.pdf
    • http://aristosaigonhotel.vn/uploads/files/55072335778.pdf
    • http://luluscafeonline.com/uploads/files/66086702219.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd03e84df---fovajulesamegovale.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bc745f74c---49057555775.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/wemupis.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e6d849d8a---zunagarasubik.pdf
    • http://maynenkhiinverter.com/media/ftp/file/gifofulukavumesodusek.pdf
    • http://gayaarchi.com/userfiles/file/20210519221548.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/8082dddfee4cb12c3b49b6747517df7e/texabusixojizek.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23c201cef2---73864897258.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=energy+conservation+means+mcq
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d23d.bin
5fe777da9a12b1a91ade3dff7dd849c81cb03ca5fb58a83b3040b9cbaf55f165		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 10836 bytes
font_01_sfnt_off0000eaf5.bin
d379e7e33a0c3d504827bd609d060491fcf925ac03517036953345ed3fb6af85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 2120 bytes
font_02_sfnt_off0000f472.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 16792 bytes
font_03_sfnt_off00010c84.bin
c0c94bb9b3ba86dab0fbd811fd5419c6e18fa56bb57936e68a3d7ea83a260668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 17924 bytes

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