Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b9a9df813a9de6…

MALICIOUS

PDF

100.9 KB Created: 2021-06-28 19:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0cf1aed0375ffae454f2b66fd8f151b8 SHA-1: 8fc4038c295f631b6dfb08979b0fd36d845c198f SHA-256: 41b9a9df813a9de629d0f6b8ab9c4c66700df54bb30cb824ef440e3e07444431
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ML classifiers and ClamAV, indicating it likely contains a malicious payload. The document body is unreadable, but heuristics suggest it functions as a link farm, potentially leading to further malicious content or exploits. The presence of numerous URLs pointing to compromised CMS uploads and disposable hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://hnkingdee.cn/Files/file/202152422349.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085357b62c15---jetozufakigu.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/nexigezurebalexoluw.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f9d30cbf776b13d67990a657da07ec0d/zulesonijukaresawugami.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c450c607d708b185afc38dd55a5346a6/rozipe.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0ec5cca47a11632f8879d493f64e7115/80739291555.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093b13ce65cc---43660520059.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ca15495d3cf45128234d453d668620f5/8131598944.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/d27406df15d126b8bbce98c057d50ac4/78337283588.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44176dae5---fesilubatur.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/30564830825.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/f908d51c7c6a8d6fad87326754ba079a/dexew.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/kukodujojeresemapi.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210502092020.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34ec6acf4---35938932813.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hi9f2phab2bkjemkoe411a02g2/67906856519.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933da91399a---zipenulazuwe.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210531164242.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/tozogeseketanufugoxan.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/e3061e7372d15ca3465289c84cb3b9d2/lajosileweluvumefa.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609179a2a7b9d---bezegofubozilebejikazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=example+of+family+incomePDF 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_off000129bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BC 17276 bytes
SHA-256: 290a56eaf3fff91460b762d3683c7e7df99463c8882d3270eeb415b5b5aab7b0
font_01_sfnt_off00015706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F1D 10472 bytes
SHA-256: 0d1e3455e57e78f9ed3608d357d12580785ea28cefbb4a89fb1882b7cf586908

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