Malicious PDF — malware analysis report

Static analysis result for SHA-256 566a06899030fcfc…

MALICIOUS

PDF

68.8 KB Created: 2021-09-18 05:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a1bca5b90204d19628f30a72ad1e688 SHA-1: 772d6061bca8f24b66acdb57e027598325fa4ae1 SHA-256: 566a06899030fcfcbf835340399242bedd38013cf22120c14bbe89e086424d1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to numerous external PDF files hosted on various domains, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pphjako.pl/userfiles/file/18016810047.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161424e7445c1c---zajenisoxub.pdf
    • http://nmways.com/uploads/fckupload/file/koruga.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/1a8480d1721ff651d6b3a4951b8b248d/29023302085.pdf
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/78206712203.pdf
    • http://belloverde.net/emailer/file/25519898336.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hcb9ueatnerr3td70ahic5poga/39463293554.pdf
    • http://gabinetortodontyczny.eu/userfiles/file/pifokujuw.pdf
    • http://dentalweek.eu/userfiles/files/dolugevidojogi.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fec82dc145c01496c5d005bd61ec4b11/kajaduge.pdf
    • http://camelliafb.com/uploads/files/202109091159292574.pdf
    • https://yumasri.com/assets/ckfinder/userfiles/files/wuguzurivolafuz.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/32619509012.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161411794a1478---82379756484.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/13256505449.pdf
    • http://infiniti.e-library.tw/uploads/files/sumejugarilajepulefefes.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/50c20d05e32f0f0ff77053561452fcfd/kezilagorikafor.pdf
    • http://cpghollywood.com/userfiles/files/92051457248.pdf
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/60253013214.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0e8d1d66b---savesezamonexenuvopowiko.pdf
    • http://panel2conso.com/userfiles/file/tavufinofowekutomeluti.pdf
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/7691906464.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=file+manager+hd+apk+old+version
    • 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_off0000addd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xADDD 16792 bytes
font_01_sfnt_off0000c5f4.bin
c662cf3f088a932e43476185dc54871ab57220ca1698f15eb517db33606a08ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F4 10876 bytes
font_02_sfnt_off0000de94.bin
3d730bace921561a79c9f9fbe1476dba99f678e0ba56d2bbd89e28513e19d078
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 14908 bytes