Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c570cbe3478adfb…

MALICIOUS

PDF

81.8 KB Created: 2021-08-11 02:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f165757b9d8addb9b54105b2de80126 SHA-1: b099ba4ffa958ce2c64f0df93bdd7d87bb1f41d5 SHA-256: 5c570cbe3478adfb71ac2b86d81f92f575154ae4bfc884338106f4cee300a166
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/59f15fafdf054a33cb49f4717719aacf/8027571575.pdf
    • https://maclashoes.it/file/vijukavasidatireniraki.pdf
    • http://www.anclupnapoli.it/userfiles/file/91003121414.pdf
    • http://gdbchurch.com/clients/43262/File/44536472821.pdf
    • https://mmagame.com/userfiles/file/xakabozewojaf.pdf
    • http://maychamsocda.vn/images/userfiles/file/dixeforavok.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a64ddb0de9e---66730034045.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0cce9468f1ae6262596fd645f4f4d99c/bidixuxon.pdf
    • http://alanurturizm.com/rsm/files/13346821942.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fc5bd074c---kulijulusozepi.pdf
    • http://www.serenissimaservizi.com//files/sedekigatafenem.pdf
    • http://volkshilfe-ktn.at/images/content/files/16354097945.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/mld47ccq1d0pq0giqdblkkjqpa/gemepejilufip.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/so19pv6aro3n3bk3sq4bdur8k3/79202875982.pdf
    • http://paroissedementon.fr/upload/files/14203891417.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6113eb017b---57972740844.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d52b6adf---62028228450.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0675a518ee---zolakadipapafadeludow.pdf
    • http://guowangcable.com/d/files/52700676369.pdf
    • https://sokolzgierz.pl/web/uploads/files/92870389598.pdf
    • http://nesemlak.com/test/images/uploads/files/kufisewixiluboreki.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a3fe05ab0---36740671121.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/poduwa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=passive+voice+present+perfect+continuous+tense+exercises
    • 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_off0000dcc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 16792 bytes
font_01_sfnt_off0000f4d9.bin
954308add6d07d9bc74719a4eb42976acdc93ab0c2b7f4d2fda362b9938a07e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 10696 bytes
font_02_sfnt_off00010d9c.bin
f04d9eceb2b5264568a8a41def21b9a93ee35a0c2fb2d4c33b3ddd30f4b3a4fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 16748 bytes