Malicious PDF — malware analysis report

Static analysis result for SHA-256 49bafe3ee0675f3e…

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 04:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2046823372c2c532c4f931ec2d6a1f42 SHA-1: 58b0fd56f0b61a02b87e70880a160f123cce4691 SHA-256: 49bafe3ee0675f3efb48e117b7d09ec1a866996c13e2e45c4c6fddcaa914adae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/r1ebpr0gut0r13kbq59nv6d29m/58883956598.pdf In PDF document text
    • https://bataretak.com/img/files/file/pixivonevosizajufoniw.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe2d6e5b8e---92497946261.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/tozasotofekadesosug.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/mekavema.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b188d685035b7b9e27c9950505d6f53f/tugavotiwomakatopafelud.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/47689752254.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/bujuvebanura.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/gujofili.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/bifeforedofizawakubato.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021830713101130.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/dewifojoxeludiluvuz.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/420c2de7ecf77780e0644cdaf0fd4da8/bifetobepiwaninizafisivon.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/xumuvawijedaxejatuzewev.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/boduxipo.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/zumapomala.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16103b0e2a74c2---72866310282.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/64378880015.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/xozodasomepawivenu.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/1p0j29oq7sm26kodimpdqdhiru/4008610426.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161257bf93e530---77313878268.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/42324715863.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210801085720_ndk5kk.pdfIn PDF document text
    • http://skupka23.ru/upload/m/ninalatirex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=calculate+area+of+rectangles+worksheetPDF 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_off0000bd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD582 10832 bytes
SHA-256: d1b443ac6909688e30a5d8344f22d96fdc4b3cad032405b756938fc2dcfc98b4
font_02_sfnt_off0000ee9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 16548 bytes
SHA-256: a636569f4371549b25118c6450b77da2e6cdc4f67fa0faedd84771f348b24d7a