Malicious PDF — malware analysis report

Static analysis result for SHA-256 99edcbb48bd97089…

MALICIOUS

PDF

88.3 KB Created: 2021-06-27 07:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bb8e39cc1e03a9a7f8c692a7c1bfa1d SHA-1: 67fe9888a03a41af969b6d35378a4fd7830464e7 SHA-256: 99edcbb48bd97089ae36b5fd6fc7f2fe28ff889dd6a892ae27556dc2c1a924a5
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to various websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially to evade detection or to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=one+tailed+two+tailed+test
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/99376671134.pdf
    • http://cancercareresearch.com/userfiles/file/fituretenawaloge.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608074358ace1---16450385152.pdf
    • https://palcev.ru/userfiles/file/31754698326.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/1gqhjme3f2pq9d9vrirb69fg6f/83059553749.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a16a10330---62986828323.pdf
    • http://fenotropil.ru/userfiles/file/zonin.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160beece12b6f6---23570693304.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/eaf56b59de9a47be94d4fae731b94adb/14833837775.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966ed796b4f---kosaponi.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160781186e48fc---90744769557.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608134e7c7026---ludesikanirifosetuwig.pdf
    • http://iwishop.hu/file/99291549082.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bee71d33635---69633032622.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/23ef55924f5f4e850dc611fc9a7bea45/70880594594.pdf
    • https://jamisonfurnace.ca/userfiles/files/68544308285.pdf
    • https://akapacha.com/userfiles/file/52996847985.pdf
    • http://www.anclupnapoli.it/userfiles/file/vuxod.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b83c8033fcb---18279103194.pdf
    • http://alnoorcity.com/userfiles/file/41292397827.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6ab357ab0f70ad4ee302d95bd4ea12b5/jozopukapukilazutofijib.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb52aed3a0c---93138398007.pdf
    • https://condicionamentofisico.com/arquivos/file/39888341915.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/fkem8npjlqbr4k5t6smn05ff7u/80740293373.pdf
    • https://agrilaui.com/userfiles/file/16246479797.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/104ccabb9a6999c8263c2877d2ebc988/gaxukerejapoxezi.pdf
    • http://sun-green.be/ckfinder/userfiles/files/sadotudezeze.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_off0000f1ff.bin
696ad6ee5ed39a61d815f1853605947f7d99b8e315c48bb0f336776469bf1798		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 10252 bytes
font_01_sfnt_off00010944.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 16792 bytes
font_02_sfnt_off00012156.bin
637ebdc952dd3faa069c94fcdd28cc8f24908dcae785f59f2f1366323822dcbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 19720 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.