Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02e8d69ccbeb110…

MALICIOUS

PDF

75.6 KB Created: 2021-09-03 07:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf8f3ab9959cdfe9ea90e4ede402aa13 SHA-1: 7078734358f38d79b1d738d5e3cd429c9218fbe6 SHA-256: c02e8d69ccbeb110dfa62e284eaa5733630eba962912ff629bf5fa798fe352f9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites. The presence of numerous distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially engage in SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/tglunj6247uori35gj0qraor8r/59102463024.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16089ead764c44---23789470621.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210803_EB2025D8AEF60E6A.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0cb7e8cf---tagud.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/kevopojoxevuguxipefovuj.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cd9ae18cf---sijubapewajanilijux.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecc111dd38---dibomezuju.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79606c9ba4---visapuj.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b2b81cb04ef42337bf510369a7ef97bc/tefiwoturezazipi.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/30294518475.pdfIn PDF document text
    • https://digireg.pl/upload/timotokarenogidujovab.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/bagage.pdfIn PDF document text
    • http://progetec.org/userfiles/files/wosugumo.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210831072926.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/bapes.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/regutilifaz.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/dekajumidigulotu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b9d08cf22---31893526167.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a69aea67fd---21900714567.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b80df1589ba73c9833fc60423a393073/89715061720.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bc1316f2c09ecb801329c76b5af8363e/22671247377.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ad9f90b3d8---lafel.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/vakugebarojesemokapuzo.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/37980095924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=flutter+auricular+electrocardiograma+pdfPDF 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_off0000c485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC485 10768 bytes
SHA-256: 3a9f18c01f259ba93e6695cd699acf5bf7026e3de2deb8ac8e617c05baa1f93c
font_01_sfnt_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 17156 bytes
SHA-256: 686f2ef7bfa780b46f4668822365694af5c8a4f86cd84443221a22ca5c962230
font_02_sfnt_off0001090e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1