Malicious PDF — malware analysis report

Static analysis result for SHA-256 278677f53532ccb8…

MALICIOUS

PDF

78.0 KB Created: 2021-07-25 18:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d2a84335e65c5c9270ef7033f65d2e70 SHA-1: 68cce954ea4da55862c8d3ead34e3b0169eb3c0e SHA-256: 278677f53532ccb8983ce2f184b0d604c07febcd7dbc51a325e3d559de41b597
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and other domains, likely intended to redirect users to malicious content or phishing pages. The document body was unreadable, but the presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://muguet.fr/sites/default/files/file/28980782277.pdf In PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed03dbfc9---xakagobarabitojepakusa.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ml5j75igo3sirao6g0f3jjrc36/37016033983.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/llit0o0tif3jbob3po881ta4l3/lulazufoge.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/molukofe.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/44149589477.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/80035296840.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/31504745481.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1971fbc9---losudajuxorenepiwovu.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/62974621446.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/d2hdhvv8v7fejsj322nn24erm5/vugepinelezerewo.pdfIn PDF document text
    • https://digireg.se/upload/45750422843.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/vopalo.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/41835473576.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cc7bm1l6prebjlqt8c8omhmsn0/23393662497.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/28765285969.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/t3lkkdq55b9is0bqulnqc9cnn4/majotujagefim.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a8886dfe6671a52486fd1df6e6c9f3c7/luwizugilazik.pdfIn PDF document text
    • https://schmitz.cz/res/file/67872085709.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/014fb732e918a3810cf43d5d9ea0ff1e/doxumene.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/33522980859.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3db6aad732c098ad0c46fdfe3400e14/fulelubuterosima.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/92915283839.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/13116026843.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/fofetebalopibuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=2003+mitsubishi+galant+es+owners+manual+free+downloadPDF 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_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 16316 bytes
SHA-256: 29aa77259011d21507091bb00b207bf52eb770f99d2e71d8054c66e6f950ecf4
font_01_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 11444 bytes
SHA-256: 7430ec75b8582e95f53b0bff968dc6a8243c9331032992dc4e9ee7958e393628