Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7b991f4f246db3…

MALICIOUS

PDF

92.0 KB Created: 2021-08-09 03:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f884253fef4f80a38d2e25df7e411e92 SHA-1: e369d74a4ac2fbe61f1929ca7284e7a55804de5d SHA-256: cd7b991f4f246db39e7b75f8d2e0b2f3d1fa881e8a98b72b839f3fd14d7e64f6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/pbme81gmdfmej6m20pb1u1nq0m/93246089512.pdf In PDF document text
    • http://cropscipublisher.com/files/upfiles/file/zejaz.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/nefupubu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982172bf726---pesaxowez.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/053282570a7d4f9dadd45fe862eafafa/zujirupiban.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c07500fa---malusulafejapopusalusax.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7fa56bf996bd37ee83ce777dc7c1f95a/divememanabisu.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/sozuzabirasulugiwalufozi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb58ea3811b---1113893418.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/92177108947.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/ludufikoxaronatiwexus.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/82696829164.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/napogawonogapuk.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a41cba3fedb---25540563593.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/j84d8f6i6fc0jajrp807t70maf/22004998066.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/73830319d7f67d16ca8a5df2c9f95a72/pigujapivovafuxisatasesi.pdfIn PDF document text
    • https://projetovm.com/uploads/files/63402842547.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/845ae79cbcbc888b1c047c857955b392/99364941593.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d92c6cae870---59578381672.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/pepuwajeropazugofato.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/40340826982.pdfIn PDF document text
    • http://mav-auto.ru/images/file/mumiziroloreladivuxotajim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=soccer+fitness+training+for+youthPDF 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_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 10856 bytes
SHA-256: b2d6ce0c6832f33fa2c4f525a5429644fbbd5eaf0118a5e7ca91f634ae15dcfe
font_02_sfnt_off00013488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13488 17696 bytes
SHA-256: aedf399536a68b5f9b3e205181f7a016637d01301f371cefc195c7ad65653f23