Malicious PDF — malware analysis report

Static analysis result for SHA-256 447c8bf9a5ead07f…

MALICIOUS

PDF

90.3 KB Created: 2021-07-17 05:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e17dec25348bcc00cdd97ea2d0d67ff9 SHA-1: 00d0e4edb9c6226354b9b230470c691db7dc8ec1 SHA-256: 447c8bf9a5ead07f839062f2c68552026c1ad57eb7bf4f8d42d1b72405f27b90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users, suggesting an attempt to lure victims to malicious sites for further exploitation.

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 http://www.yoko-ono.be/images/userfiles/file/vafeju.pdf In PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/gre8rfoe3sqgrh3vh6jgf742du/56633093909.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c877532fb4---33189461133.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/99e1874bde5082fbf47a92659eeeffbd/39994256006.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pajometakuzobuxibuxilu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607835a675bb1---5278765142.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0ea563a7---94038897610.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8bc7ce9d---7998498182.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/majuxizo.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609262265d3d8---woxodugisevotojotiv.pdfIn PDF document text
    • http://santeh.md/img/files/taxaneboz.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/mej7cd9d4c1h066gf94s6u3i3r/49236164507.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0eafd9e97a3443d4f8f1c2e612e52f34/wabapirufev.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/wagetuxeluziw.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/16527643011.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1eb55132---dasuzapixo.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/4njiv963532me73q42l28r10p7/kizabebo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7ac673d627012fc3eb6e531829fae024/70994381835.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/28307170977.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1q97nmld7pb78vi17kfhfda8p2/75351191097.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e9cc18884---domimewotilaj.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ca7371726---76630635238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=list+of+prepositions+with+examples+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_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11732 10908 bytes
SHA-256: b71b4bc4567f89f0e72335ba166df3516e1eaf3770f01e90fbe599715cbca0b6
font_02_sfnt_off0001304f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304F 17020 bytes
SHA-256: ddc31e6346304a0757c5f470ad99e487f41bf2074061f33b6a67278af1d3c6d0

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