Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b089a2a8e4f96d2…

MALICIOUS

PDF

74.8 KB Created: 2021-09-15 00:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09d45734c9f3bfd9c925c87ce171f36f SHA-1: 12bbb49aaac39a6f60757e8c885a228d983c00b8 SHA-256: 0b089a2a8e4f96d284fe0a6f5e8534bd4895d7ab47f82a65b0a4a8fb2b26aebf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://allytemp.ru/uplcv?utm_term=online+video+streaming+app+for+android PDF link annotation
    • http://support-cmu.com/filedata/file/38740432087.pdfIn PDF document text
    • http://pmke.cz/pictures/files/komuba.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/54221045278.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/9e40f0eabfbbb132c93497e45cd4b77a/71042117603.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/lapuxegofekamaropi.pdfIn PDF document text
    • http://prompol.com/media/file/4707167579.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/wifutuzoxu.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/bidokibo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0a6580b3c45ddd0a0a89b34caffd0f9a/jedavagepasekigovuligu.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/81806325477.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/bebikapox.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/80521425463.pdfIn PDF document text
    • http://altinay-law.com/images/file/26249880109.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161410e3caeced---ximeginamogokatixulota.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0e029318eaf8f46d8195a76106b3b477/tuxezowukexazemudal.pdfIn PDF document text
    • https://ottopianos.nl/files/482239977.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/jekegovuvukejom.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/72815823734.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/bogomifufexezokuwexejo.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/besuvabe.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/69380985417.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/nalinobekafajobewowekazim.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_off0000bfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDA 17280 bytes
SHA-256: 91e9aa43716f3256c4a80de84e6d8158e7a6b5a256c9d20be491c2d74ec39796
font_01_sfnt_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 10932 bytes
SHA-256: 8dc51e32cf516bfb37638f118a385fa568be27b5084c5be8e15ffbb8701fc0f0
font_02_sfnt_off000105a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1