Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa07116da2d2ce8…

MALICIOUS

PDF

86.8 KB Created: 2021-07-09 07:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 014de6351c655447e89e4e8d1cae2d43 SHA-1: 63059016ab821068a8ac0e14af7ffea105bd03ec SHA-256: daa07116da2d2ce86b323d5194e8a7a772960e851842f88032289a81308e498b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160836ff084892---nojixeka.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d254f54fe0e---66021806392.pdf
    • https://privatecambodiatour.com/userfiles/file/dolosupanozotupup.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/23eb3c77b57e70d9c6ee42c788e26871/fuzok.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/b973df5ec3064f27bdf8413b5b2c6454/29498898308.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/143234rtpvkjpj6uv29p7s5qa1/81535868559.pdf
    • https://jhservice.net/imagenes/galeria/files/23180605325.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/dvpe9oannefcg4qur7nm42knv1/88673733234.pdf
    • http://rlangkhan.com/upload/userfiles/files/wigezom.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1268d58161---zewozopip.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609698074f8c9---82328201574.pdf
    • https://mfdesign.hu/files/file/44005754978.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160872de991e88---23171230086.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60d31b5890---39867270235.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/hfcacifj3164stdia4m6r0kgo6/46756440818.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/deaabaade0feed4d30f9431fc4b75aa0/71975374415.pdf
    • http://chonburi33.com/userfiles/file/mamezemufa.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/f637c77cb0ae79774cad6fb99232cf6b/kotubibulikuwu.pdf
    • http://saglikligencler.org/files/files/305278990.pdf
    • https://travelworld.ro/userfiles/file/sapemuwesovanokifuwawafar.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa64f8c859a---gugoru.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/zixazunapadamalajibubu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=place+in+marketing+mix+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_off0000ed03.bin
ec5189487f7841b14918f82e317e89da08e5f635739b67d9c114b38e845f32ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 17936 bytes
font_01_sfnt_off00011bdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDD 16792 bytes
font_02_sfnt_off000133f4.bin
3ca024906a360253519e767066933a522a49dddd8a78b3d8077fe5dcf8222d59
pdf-font-stream PDF embedded font (sfnt) at offset 0x133F4 10872 bytes