Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6d7c692eac3c53…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 17:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57eb7da570a91faf5ea7af77deab74a5 SHA-1: 35ffa9d59b0b49cabb0b77d13f6ddbedf7c65e2f SHA-256: 8e6d7c692eac3c5393b46f975046e8a42b5db88dc701cc38202560f2302352ce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://jamalcar.com/userfiles/file/ruzotakubitunaka.pdf In PDF document text
    • https://bokaichenyu.com/upload/files/61607032846.pdfIn PDF document text
    • https://olterus.net/contents/files/87070176676.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/83036046994.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/41461971901.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/96135775205.pdfIn PDF document text
    • https://bawauang.com/contents/files/33201832635.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/36442986940.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/59924612094.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/96490407600.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36c17553a066ad2fb6e9e4f0ba9f0f46/32793106448.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/83125680654.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/31874546903.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/16556011039.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/41012629988.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/11188361058.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/61498950927.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131515f9ee44---jufifazifeforaxilonun.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130b0d021406---24166462711.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109100420138521.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6ea50916---kedunebutinoparek.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613513ad80b10.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+official+guide+to+the+gre+general+test+4th+edition+pdfPDF 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_off0000cda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 20360 bytes
SHA-256: 2b349224e93d4972942b8dd3d2aab8f41d6582d9cc96d7797fb9ca85c022fc46
font_02_sfnt_off000118d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 11040 bytes
SHA-256: ab2623948bdd87ed40f8448f732255d9aee1ac32e0d7926f4e594c180a307f44