Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8dc0e7df38d259…

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 04:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56c135efc7f39f2c9583eb746ca7f012 SHA-1: 6c639513bd038bc1cadb788bdec442ff7d1b5ff8 SHA-256: ec8dc0e7df38d259e50f717f384dcd92c0c600cad3f37113fa9e8526fe9ce957
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/0p32kfpc877lbv263vmtnd58dv/63129291365.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd537e9c597---sadowu.pdf
    • http://americandeliorder.com/uploads/files/mepajixanikikonomevijoz.pdf
    • http://www.proyecpapel.es/ckfinder/userfiles/files/65010978597.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b76c3168b---zagosivelejowixanawux.pdf
    • http://www.ferm-matic.fr/upload/file/wugavamom.pdf
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/44847776828.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a9deb32a---10577590140.pdf
    • https://aravlicraft.com/cmsCart//upload/file/40095488805.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a8a77fe9f---tosedisenivopiboponuxiwa.pdf
    • https://szabobuszrendeles.hu/files/files/linufaduroda.pdf
    • http://chrislahoda.ca/userfiles/file/57195804606.pdf
    • http://renknh.com/ckupload/files/89933851944.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086214ad8ec3---33163808744.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/fe0ba90fe69342563d1b6d49bd0a85a8/86085635295.pdf
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/sinofi.pdf
    • http://geoodwierty.pl/files/file/92198234752.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/e1134e13ae3359eef6d12be7d54f6152/pakekufusagobevikigakaj.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/aa49dcc359125085884e5b860e793a65/77104391612.pdf
    • http://agnieszkapawlik.com/userfiles/file/70741424804.pdf
    • https://accuratesearch.com/userfiles/file/toxejoromufiwuxoli.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5li0vlgqkkb30fdll302ngsul2/51347022246.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c50d8e1a27116df314bd9a696ad77082/xewev.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67e8edf617---wopola.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+hunger+games+battle+royale
    • 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_off0000ef95.bin
70e35a241712a5fd3bfd78c10c00698a07e4c88b0972c17641e2edce34f6b03f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 17032 bytes
font_01_sfnt_off00011be3.bin
d23433268093e4f1bdde7aa4b621caa3243750f573234e01926a3a1834e086eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE3 10780 bytes
font_02_sfnt_off00013497.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13497 16792 bytes