Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79d802f31f06cff…

MALICIOUS

PDF

94.3 KB Created: 2021-07-16 01:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35e33d3f38b20c107f707be2f0f8c5a5 SHA-1: 5fc0c2d9a869ff75f91da146450c545879480641 SHA-256: d79d802f31f06cffc153d961d7f062a84317c229628843c52a2b41d2461f3fd1
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. The ML classifier also flagged this PDF with high confidence. The presence of numerous links to compromised CMS upload storage and disposable hosting suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/26e93342999e9751d939313970d8bc9d/79359466644.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b97ac4bf---481530731.pdf
    • https://autosaloncenter.com/uploads/file/89028715292.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f05ecdc4cb0---92466225466.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/63013801960d5811c6810d.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160762d7dea7a1---33476949707.pdf
    • http://quickvideo.nl/userfiles/file/12662891831.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/rofux.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9274ccacf---bipuvuraguvo.pdf
    • http://jrmhandling.nl/upload/file/zetide.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b402c544a---mufupajivupila.pdf
    • http://udemadriatic.com/userfiles/files/88536016979.pdf
    • http://biirbeh.mn/images/content/file/69525092071.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1a0404f21c0e4ea7f4274dfd41e3cef6/94861327342.pdf
    • http://rana-international.com/userfiles/files/67242034627.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775e2c82bfa---9201950887.pdf
    • http://sage-chem.com/image/files/20210701_000357.pdf
    • http://myflora888.com/ck_files/files/80509111795.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/23cdba46b1859c8fc82718e87a50559f/68956768053.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16096897e98f1f---54546057955.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/837c0b0fd5e4bafab99cb6d35f92be1f/42097958037.pdf
    • https://capital-tic.com/upload/ckfinder_temp/files/20210607105712.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb4dc51535---fobezalozigitivoxamorefi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=reciprocation+in+a+sentence
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de22.bin
6d77f910ff0f1945995e3cf3b4b5abdb2a28b2d9459d558453c173e28ac80706
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE22 17176 bytes
font_01_sfnt_off0000f73a.bin
a7aee00564cf169a7c9c469dc8730d1b0c29ba2f124a3db4b49b4b1453887039
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 22128 bytes
font_02_sfnt_off00012e92.bin
c08e53c127eae5ee162f835a5e9cd9c80affc3a1e9ea08171e1ee161964142bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E92 2740 bytes
font_03_sfnt_off000139b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139B3 16792 bytes
font_04_sfnt_off000151ca.bin
d7a2e559837086fe23adc6399f4610553a6ec08ece68c632a8d1bf9ee86eb478
pdf-font-stream PDF embedded font (sfnt) at offset 0x151CA 10364 bytes