Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c86af0e757ae4dd…

MALICIOUS

PDF

132.5 KB Created: 2021-09-20 22:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d98f8f26b438094c8a07bbb66ce5a7f SHA-1: c32163e0532706153c1418f01360f74e940d2b09 SHA-256: 1c86af0e757ae4ddebad9664ceed848f955d74cacd67e168b756e6b333d0c14b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://olimpic.hu/ckfinder/userfiles/files/49792077148.pdf In PDF document text
    • http://zit-tech.com/userfiles/files/xuzikajaduwukupig.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/lufijiw.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dfe255e2b88550772558330e72cbf22/7341060614.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/rudijazexuluzoser.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/kesulexafabiretuzunegize.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/kuwakoxagavisipax.pdfIn PDF document text
    • http://minerva-collection.net/files/files/wavulokejuvib.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137371394030---13155740248.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/11884530665.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409e887683a---mununatatodajabes.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/gapufiligibeloba.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/nofiwepe.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/4086584616.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/zixejuxijudekepexidax.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/52435707798.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613026153c08f---1213324017.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/73713331899.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/801789902.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/belitug.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/53145065127.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/70514709317.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/raxodori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=lucky+shrub+clash+of+clans+wikiPDF 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_off00019ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CE3 10692 bytes
SHA-256: b8c0d67e9f2b617cc5c6b48bc48d224709d05d0d4a0fff2df039379d223cca20
font_01_sfnt_off0001b570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD82 21328 bytes
SHA-256: a7a73d47e31e922c52e95c55c24e86ba7900a09b540377edc135b215cd23b7c5