Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c6142d572f939d…

MALICIOUS

PDF

75.0 KB Created: 2021-07-29 11:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36e32de2f24e368bb8ebc1f8b2ad5c5f SHA-1: beb0fc9f646e3f71e64110fc7085b4330de6e3b8 SHA-256: 38c6142d572f939d46791a198a88ca1ac67b0ef11f40c1a586a29f2752573c25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and potentially malicious PDF files. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the use of malicious links to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://archism.ru/uplcv?utm_term=how+to+use+the+mi+power+bank
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3r6br10a8h8rhhg76dfk38njvs/xosabogatowokesikunafizif.pdf
    • https://vgi-vn.vn/app/webroot/img/files/daveragabi.pdf
    • http://sushistoryus.com/uploads/files/punogam.pdf
    • http://ecohort.com/userfiles/files/vexosuwebejepizijeseko.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16088aaf58558f---dasoxajez.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9e39a089bcded346f9e53e9ba3df15fd/50655526781.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a17254f8267f2e850e9dff139bac6f9c/kowonav.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/21148939164.pdf
    • http://libron.pl/fckupload/assets/file/vorur.pdf
    • http://www.icareonline.net.au/ckfinder/icare/files/59726346123.pdf
    • http://tamlaproject.com/userData/board/file/57142128967.pdf
    • http://ouhkpthaa.org/userfiles/mivakugesogidilejaweb.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4vu4c24d8mb68v3p2ifsqngsh5/nakapive.pdf
    • http://jhferry.com/data/fckeditor/file///soluriragosemareriseg.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/s5d6a9fe6aosjlenhgbgn9ei6f/30860465117.pdf
    • http://amandatravel.com/userfiles/file/jonidededisimafixa.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2b2f2d9b---kizij.pdf
    • https://musikkursus.dk/userfiles/file/suxuza.pdf
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/rezujozazesuzif.pdf
    • https://invest.pl/userfiles/file/duzarunogumavefugogage.pdf
    • http://pension-erlkoenig.de/img/editor/file/56428471317.pdf
    • http://pampa.be/uploads/userfiles/files/98166512342.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_off0000c28f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC28F 16792 bytes
font_01_sfnt_off0000daa1.bin
ba85d57334fdf69a23d42915c7e577fba47ae29ed2f3bd30c71715c077d949be
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 16356 bytes
font_02_sfnt_off00010514.bin
689725cb2649a107f517cc2e2248bee0df5c03927d1a249f115f731c22e1e6de
pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 10880 bytes