Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50f79366130c5ac…

MALICIOUS

PDF

108.7 KB Created: 2021-09-02 23:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a530ca9c9eeb17c711cb460a59f36f82 SHA-1: b6b5ed6c44b352b0f401747ac6f9eb15c91d3f60 SHA-256: a50f79366130c5ac852faf256e6eaf333601cce7ca2bc463bb392003f4603b4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://rugsinc.in/UserFiles/files/4441637749.pdf
    • http://uptownchantilly.com/uploads/files/gofamufajesosi.pdf
    • http://inbond-cn.com/userfiles/file/51932942932.pdf
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/48143292807.pdf
    • https://thefertilizergranulator.com/d/files/xekizevikodar.pdf
    • https://rijst.nu/userfiles/file/46157465125.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/bc3135a6ce9aee738a57d6dd7b0ab0f9/joruxanuwirusabixo.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c9237f189ff---sezer.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d127881059441dbd17c07dedbd011a2d/83440498331.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/vujevanige.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d3f7cd524---liteximevedurotamur.pdf
    • http://modnyi-buket.ru/uploads/files/82559738594.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/367feb8bb2893b4380c16b87a1c7f7e0/tubozepijarivuzolikaxur.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/tojunugev.pdf
    • http://laihoawedding.com/app/webroot/upload/files/17138588567.pdf
    • http://canyonmeadows.org/userimages/wozakubitalili.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608145dfa3119---17604882934.pdf
    • http://adance0112.com/upfile/editor/file/17496932521.pdf
    • http://www.lircai.com/web/inline/file/nutelewidikotufaxa.pdf
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/mufudikugoxo.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6874151e---8127018905.pdf
    • http://gordostcrista.ru/userfiles/file/35041088582.pdf
    • http://agcslohian.com/userfiles/file/fadorap.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/23031683581.pdf
    • http://4seasonstours.in/userfiles/file/xupedu.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/26836591582.pdf
    • http://jgbt.us/pds/userfiles/files/52441197292.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=strecker+synthesis+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f8f.bin
1f67d1e6a7dc38aa839eb92b26049eebc1c28ba088c165d399b25057ba7cd6c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8F 19844 bytes
font_01_sfnt_off00017434.bin
a1fe27e6cb3e281de91d9bfeda090f75584bfe514d73a40a4cca8752551ef651
pdf-font-stream PDF embedded font (sfnt) at offset 0x17434 10672 bytes
font_02_sfnt_off00018c97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C97 16792 bytes