Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c83abc75a12473…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 05:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 162581dd1bc8584b8e3d84aeb2ad05b9 SHA-1: 698dd9a938ec39b71c349d86d79a6f9392cbefa6 SHA-256: 85c83abc75a12473fd6c8553863b6da47eda0df9182d6e6ea53fbc8748b79eca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting. This suggests the document is designed as a link farm to redirect users to malicious or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://solamsys.com/userData/board/file/63367833330.pdf In PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/65028568073.pdfIn PDF document text
    • http://martonelektro.hu/files/file/7383953503.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/63348914537.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/46083667485.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c4ce9e470a8b0dfc02113fece8184af9/gotojakawilabigezon.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/11834809667.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6lt8b91q3ebn2s8e90rk8cspal/baxikedazidot.pdfIn PDF document text
    • http://congtyvima.com/images/Download/movifusitalojewu.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/pusojevifuxasufotajidida.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/61243710386.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/47926014342.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/15484704084.pdfIn PDF document text
    • http://sdes.in/uploads/33850422233.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/ruxazeduzuvu.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/zefisopakujofojo.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/piwodajedozewunexumegesoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087836ad0d9f---diwefevefikijo.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/23571415937.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16127f47ac7a7b---5575058850.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/42235689289.pdfIn PDF document text
    • https://limsurempat.com/contents//files/28348126948.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/75712020676.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/4646357820.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/394c3a5050fcab37f910b2c798f2ef09/23266881874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=john+piper+desiring+god+book+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c5031e0abcef11ea7b7957826c6e9d6d/zozedomulara.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_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F7 16844 bytes
SHA-256: e67f54a525042e83f61ebe29ef2f706a9b41904df57e831a0965b14db9aa034b
font_02_sfnt_off0001255d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 10696 bytes
SHA-256: 0d0d1176e4a07bd18fd8f3e3770cc2bb053d34134b554900ba256828ad8caea3