Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d7ea5c50a2a0e4…

MALICIOUS

PDF

55.8 KB Created: 2021-06-14 18:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 405b0182ae75bfa8432a3609ac4e735e SHA-1: 72f37991597eb79971cc4afde981033af096d2b7 SHA-256: b1d7ea5c50a2a0e4b17172f901ad2027b9e02611bc8a2693cb09383636c2524c
154 Risk Score

Malware Insights

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

This PDF document contains numerous links to potentially compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains text related to a 'quiz pdf', likely a lure to encourage users to click the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8137

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://allytemp.ru/uplcv?utm_term=types+of+sentences+quiz+pdf PDF link annotation
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074b9862e62b---xananar.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071226d1e10d---jufes.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160849b4712b9f---diviworuxituzi.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/12bd2e75db210c9d105c1d9c623fd915/mosabefowoterubug.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/tekovekadagupuvuwodowimef.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9c9c96d5---85128301065.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832f3f48129---sebugirom.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/77b4c370baa153091c0b44c1308326dd/94561593397.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d41c52d9bbfc81e6b7c023174fc88486/zopeja.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dinosetabatelarupin.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/73594902812.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/28646960237.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffeecc442---bogagafezixalerozizulojof.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/92701570877.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/18f6148cd790d17922485fbc3624e4e0/zapefutazobitosima.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/74913400347.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 4920 bytes
SHA-256: cadf91ed445c5cea35c28901e54bb3b39542a1b49e0ca36729feacf4675b45eb

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