Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67f57535b1e958f…

MALICIOUS

PDF

86.6 KB Created: 2021-08-17 09:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9703fd9f80b64807ddd65cc7374ede88 SHA-1: e4d5ba4d1f3b811d8a36554b57f9761dd662efba SHA-256: d67f57535b1e958f1782ae8fc9a59b9ab96f1c62726603c0d6f38e90a80d6523
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The PDF also contains numerous links to potentially compromised WordPress sites, indicating a link farm designed to obscure the final malicious destination. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3394b11d2---62640073123.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/39a9343818cf4620883e85f02a22ce9f/17353819823.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b559f619d5---rusad.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/52774152090.pdf
    • https://dotcomtravelegypt.com/userfiles/files/89040650063.pdf
    • http://hotelbelleepoque.bg/userfiles/file/xomopomulemanamipikifole.pdf
    • https://pioneerlift.com/upfiles/editor/files/4160347323.pdf
    • https://securitydm.com/slicice/file/jezutozez.pdf
    • http://newdimension.su/userfiles/file/zotegotem.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f522279e8a---letipidikalanulomupe.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/58148954454.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u5tr43m80mkjqsqpq4kqsge8t1/tipazesijuzawokariteg.pdf
    • https://lawina-radom.pl/files/file/26289413298.pdf
    • http://vesimport.ru/userfiles/file/feruzimovepanugab.pdf
    • http://finpacecuador.com/userfiles/file/xiwugapisonutetak.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0c1ac6236---77706722819.pdf
    • http://nceed.kr/pds/userfiles/files/20585119131.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2b7f1a91b---fagezejisipokupulol.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hft1me764rolrrde4sipqp4oe4/nigavunefe.pdf
    • http://thaimassageboy.com/ckfinder/userfiles/files/memilag.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ae98ae45---90431379201.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/42fcfc775caaa424ba2f25f91171a4db/sukalavamapolesowejutob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=accounting+for+governmental+and+nonprofit+entities+18th+edition+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_off0000ec99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 16792 bytes
font_01_sfnt_off000104b0.bin
96443135f6dcc62d980eaa021ab21f448dc2b11f2869291a816d9d31c6db3ac0
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 11472 bytes
font_02_sfnt_off00011f8a.bin
a29894c4c1fd49bbccb8d4c2ee9d852a5e385dc65cbe4c055ed4078884fe35f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8A 17032 bytes