Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b0f3144de64fc6…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 09:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 855dc1811b2361e8f6f5c9563d057fff SHA-1: 98b51b23a2ade41a9f5130777bf02ea148827d54 SHA-256: 83b0f3144de64fc68e3b78b05b3471ab7979e5f3588948472bcc32914d34ebe4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains embedded JavaScript, which is likely used to redirect the user to external URLs. The document body is heavily obfuscated, but the presence of numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggests a phishing or malware distribution scheme. The embedded JavaScript is likely responsible for initiating the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://legyenegyjonapod.hu/userfiles/files/vatubusogewatet.pdf In PDF document text
    • http://ruihuitax.com/files/file/43228766578.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/12910384054.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/nurevesexa.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/zasukijezazawunijiso.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/josamiluxil.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/vukamexum.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/wegetulamutamobax.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/26970571739.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615326fd0d613---88878102007.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/ponepije.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210912174631.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/42777275956.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/24544588366.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/34020308702.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8d101889---92509955544.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/relemesukugawigasumimaga.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/70543589960.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/92940952694.pdfIn PDF document text
    • https://etimes.mn/uploads/files/69070908069.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6102307e---vezegemizujedoneladefe.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/20585118289.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/xekevedaxiku.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614b19f885a1b---89953554063.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/24641702455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=it+takes+a+man+and+a+woman+full+movie+online+freePDF 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_off0000b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A6 15148 bytes
SHA-256: 7abd0d319f9128fbe580f030b6b9392c7ca8b4a1b705c0dce01f14322a05eb35
font_02_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 10808 bytes
SHA-256: d22e9f9f2f59698ace2d5a0c36d67558b1502b1099af49e90040505154d736fa

Open this report in the interactive analyzer, or submit your own file for analysis.