Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c6536701bf5168…

MALICIOUS

PDF

98.0 KB Created: 2021-07-05 07:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 846a88f5a13753c158715c37246838df SHA-1: 21e82701b0682e61c4b51c43e5e468b718ccf99b SHA-256: c4c6536701bf51685d39df06f18d6731b9d8be86a276f53fd718955dcf05fba9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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.urbanwaterways.info/files/gudobuxasekozipuzolojijuk.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ac23064e7e4---77186331695.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4f34dac3c---24111923549.pdf
    • http://heninrealty.com/userfiles/files/78526007680.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/v41qr9m96nknhvpe115fv4nnj3/67199260409.pdf
    • https://palcev.ru/userfiles/file/rebefigiziripogoxujulup.pdf
    • https://hospvetcentral.pt/site/upload/file/21169153654.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ph8g31n9rt2uos7jig8jlkkn6f/vigexagijisorezegemipor.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2b96ba8p2h4t6cnvdpi7gk0d81/74863247121.pdf
    • http://diversecityuk.com/userfiles/file/wiranupolaxon.pdf
    • https://bookatowncar.com/userfiles/file/46509290676.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160866a9ec5fcc---sorumokotanijixamo.pdf
    • http://volamtuyetthe.com/userfiles/file/49464995242.pdf
    • http://jshtextile.com/UserFiles/file///49443307151.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/m1v8h7obmodaq2kng33af2157q/69857497113.pdf
    • https://circolodelpistone.ch/userfiles/file/tuvowipizometapobogemoji.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/57932124133.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2696151da---zewajasuwolowarevilebusaz.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/eb9502d769b45c1c883bcd692b93e3d7/48698240759.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/fe637e59192c4a992ae1f2e89e3e2452/wurarowaku.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/ljiqrr03hmmfsu2d5vvqqqnk75/52089626084.pdf
    • http://daiwavn.com/uploads/image/files/matasodezi.pdf
    • http://petersonhigh.com/clients/33446/File/72246770082.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077332cdb216---65663980299.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=well+done+smiley
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/dcda5a8473c428aa6525f814059394a5/81409058757.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001099a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 16792 bytes
font_01_sfnt_off000121ac.bin
6ca7f1473146e66168956acab068ddaf26c6c1b6bafde38dd680e62a4feb6523
pdf-font-stream PDF embedded font (sfnt) at offset 0x121AC 17144 bytes
font_02_sfnt_off00014e1c.bin
c40e3f72e96981aeb44efc5536b64e39af0c8a98ac1a50de1965bd6b04e016b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1C 10156 bytes
font_03_sfnt_off000164c5.bin
9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40
pdf-font-stream PDF embedded font (sfnt) at offset 0x164C5 16236 bytes