Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d5ca8bc7838a3d…

MALICIOUS

PDF

102.7 KB Created: 2021-08-23 17:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5156b0622503a9b5bebb5da529628fe SHA-1: 27872d05e37b29bb8270a9b129550229d33e3e65 SHA-256: f6d5ca8bc7838a3d76f11557e87d187b31b5b0170ac924eb8787d343919151a0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites, which are commonly used for phishing or distributing further malware. The presence of external URIs and the nature of the linked content strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://cr2tek.com/userfiles/Proj_Name//files/91844902570.pdf In PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/26928713273.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/n7gc0evh2ac9u8m4n28edr3rg2/gubawemasusadubujedip.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b52f2473c4c8b5efaa41e60a4aefdff4/37521053094.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/99730732683.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20218211549278965.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ca48f84dd4e94215bdc481c7bffc4ef6/silosajodigunalijon.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/745ef67c409805135556eabbc92ab13f/38522037868.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/5302f012d58d0ea54d5871c99f908abd/28075599104.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/pukutefemajoparelolaw.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/tivetasojirajepalojim.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/51801627805.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bc33a8820---67583626621.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/14748704065.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ecfc1b48428b42f1ecdabf0cbccb1f2c/86135997808.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0dad8cb0015c416d491651ed8bec06ad/66790724125.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/59649202810.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/82083774470.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/56570397498.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/83195004898.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/82092375726.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/77348502229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+four+utilities+marketing+creates+arePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD8 18132 bytes
SHA-256: 09acfd8e03545dcba09a9546ee5dc0163af60c49f6734d699434d63738422889
font_01_sfnt_off00015a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7F 10936 bytes
SHA-256: 0af2951895ceaab3721910d50570aebae9a3d6cdc60d8e3f67697031ee3bd0e8
font_02_sfnt_off000173b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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