Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee058f5d8c87e42c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-02 03:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f3cfbc0657e6cba8dd8f6c96da46ad38 SHA-1: 3d45c7841fe8e9430943cdfde1ce66335a909a91 SHA-256: ee058f5d8c87e42c565470229f69d815d7d3e897f8c16c9a8c997a813a85f7ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving as a downloader or redirector for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://praconsulgroup.ru/pict/file/miduwetamofazeme.pdf In PDF document text
    • http://a-mega.ua/images/uploads/file/lelijuvibeponizilej.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/pogibemusakipu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ea060d1b---5332843352.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/tidibexo.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/raponepitan.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6fa63d531197b5b24eba6a098485ac31/wozifusesujolevetovise.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/50787525471.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161141a6a08b84---20507381081.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/rebofi.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/busurofegopefoxu.pdfIn PDF document text
    • https://bloc-immo.com/images/97384155114.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1610f001861b55---posutenuledex.pdfIn PDF document text
    • http://bjallstar.com/upload/file/sebazaja.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/lakogogew.pdfIn PDF document text
    • http://epicridesnepal.com/files/tofuvezitobinagidulepuzum.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/jitupavem.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/8520539650.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/tomimadikebipikejokalivu.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/zubagawokunumusow.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c5a13f3a055aecfb69410231302c279e/rilese.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/88776647641.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/22709272911.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8442e201b2a78a078f0ab25d948a3a9d/80179813915.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c251a18f326---98016056066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=imp+meaning+medicalPDF 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_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 10320 bytes
SHA-256: a325a8c255c66b2ffce46fe4194b1f6d73816147e65982c8873bfde83d51b79b
font_02_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 17780 bytes
SHA-256: 6bdc0119296c480b2c9c0177f3d36655eb3274ed020f503a803b3df6894be70a