Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29504e83ff6c17c…

MALICIOUS

PDF

91.7 KB Created: 2021-09-08 10:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df37129903ca433bbefdce6af1d0b97f SHA-1: df78d43fb5e9acfff4c4630897f3a397806a798e SHA-256: b29504e83ff6c17ce7efb873317ffb40e37019911995a6226630dfecaef9bc05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the PDF structure itself are indicative of a malicious document, likely delivered via spearphishing.

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://irlanc.ru/uplcv?utm_term=reactionary+fever+%E0%B8%84%E0%B8%B7%E0%B8%AD+pdf PDF link annotation
    • http://learningkey.org/userfiles/78919679669.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/e73c392ea085fa09327c63e27e1a7054/99227845539.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f7816081e9e0d85fa96d954c92463ccf/42428368951.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/66005122890.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8e31bd57d---zedaki.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zefijiralemalutipofaw.pdfIn PDF document text
    • http://cosmoscm.com/contents//files/93807492417.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/sovam.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/selozo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bef81532a05---69283146596.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/dd11fb7ee4bf1438c9b37e422c377694/1249514445.pdfIn PDF document text
    • http://dzbnf.com/upload/file///39042813320.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/23296438738.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/gowalajomofivimijonava.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b4cfe9cb6f9f1da06088aacfb8992bfa/pekejozuwilapuve.pdfIn PDF document text
    • https://ysh.my/userfiles/file/82139581509.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c868f092d5c---24221633290.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/d957291eadf74c628395e5343b05266f/luridomoxonama.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0d1a7bb95f967c3adb9d3c0e15333f47/maluxoxekebijatupof.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//85629343674.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/04af1bfc57335bcce323ccc3f25adf1d/kobowilosepaxifejax.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nc1qbf52aj3qvmg4f83tli5534/85073381429.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64010a1cc---fuvitetebokiworavi.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/dolosem.pdfIn PDF document text
    • 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_off000101c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 17620 bytes
SHA-256: 9e0a5baebc7097fa1a56cf11a82a6af2dcb7d2cfaa43432d51aeaeedc649be6b
font_01_sfnt_off00012f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 10624 bytes
SHA-256: 17fd9dae7c19771687a8e10d2c9e92f467060fd13d80878b54ec0d725395b645
font_02_sfnt_off000147a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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