Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5461d5f2afa176…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 13:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 57f925d14a45a03653afd7af9c409dd1 SHA-1: 241c877a723c1e5e0a9f21aa1f9cbb072d65cef5 SHA-256: 3f5461d5f2afa176ee26e7cc09662cface2ef530ce0b62e6229738991e8b4d51
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a PDF phishing trojan by ClamAV. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. The PDF structure and embedded URLs indicate a phishing lure, likely to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4058

Heuristics 5

  • 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
  • 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 http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f691dd9aaf---51126010666.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f9828793d788496918acf9010c0ac5f1/bodazekonovelevoxotu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ba703df39a6a07d2a99e36e1c84b66f5/migivisevolokakakuwa.pdfIn PDF document text
    • http://goshaggers.com/clients/2/2c/2ce39afd4341152949bc146f79210d6f/File/53740035062.pdfIn PDF document text
    • https://ambalatender.com/upload/files/98474998892.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/75678800380.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/vapenatibejamiwiridugatev.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/31651704357.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/6135650354.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608870f93e5e7---sanumabepoxov.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123954c03e31---fetozekinimukitusureb.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/lavov.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5525e9a6a---bovovogoliko.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/kaxajikubuxu.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/6571506aec8f6c565fae8ba016a9bcee/98999951792.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a551638f---68912306445.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/niwuna.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/mufipiwal.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fab35d4a2---texofobo.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/54457721009.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/40219491620.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16106fc841f786---42347853125.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/28831623466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=class+11+maths+ncert+solutions+chapter+10+pdf+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 11276 bytes
SHA-256: bd2b501f80938a1d0f0f56d1035de308238dd67927ad74bd1efe0b1b0e6d0de7
font_01_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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