Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc8ade15369b6b4…

MALICIOUS

PDF

88.7 KB Created: 2021-07-07 02:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fdab0ed65e54517f40b23f9ce316edbe SHA-1: 9b5e22fcde8857724b5f5fcfc24ea2897cef3eb8 SHA-256: 5bc8ade15369b6b471d6411896094be3f4aa334ecc8525f430564da3d5fe4b80
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary goal appears to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608e14a84dda3---97849301702.pdf In PDF document text
    • http://jhferry.com/data/fckeditor/file///pitefutedaboxowif.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/67815644258.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/rokexevulerotejorenixo.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/21788227249.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/1c668ae1eed02f1d7fb00b1425aaf2d2/gofabepemenusaraxisogelo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9593b74b---rogiluwefuradowatizumowu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/32183292962.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6822ce5c9---vemulasudiwezutubo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1bb89238---86930404371.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d375de57e93---xoputo.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/35324361498.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/aa576ec6da12b6e033044c6219a67b89/69505780202.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/s11fmvpjhiabcf1akvhvl957dj/75579620542.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/luvibodadoxomuj.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/lf0tad7pa8fp731t00m82kkqf1/rerip.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/10207369855.pdfIn PDF document text
    • http://akssert.com/userfiles/files/47905784511.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc84f608f2---37294604500.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c6bc2a1b1---fidenovis.pdfIn PDF document text
    • http://ridendo.cz/files/file/9672985228.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/27232950757.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/rukekitosewodasasolifa.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/a7ln4hd3qhn53j3b0uhnbqq60b/tuxaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=letter+to+the+editor+samplePDF 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_off0000f671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 17616 bytes
SHA-256: ae8758f99305ea3cffb824d7225cd53935db7b30655b8f64a13a5e918153a9d9
font_02_sfnt_off00013c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1E 10508 bytes
SHA-256: 8a97a75da8f26118400b54cd403a754ce8f6e48654f4ca6072f202336c04e65f

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