Malicious PDF — malware analysis report

Static analysis result for SHA-256 8415ed4e2269fa31…

MALICIOUS

PDF

85.5 KB Created: 2021-07-17 03:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5494b565c2eb2f1919c5a07d62a2f4f6 SHA-1: 37c4d89a55c87c304fbeeb1fa917632d3f491e87 SHA-256: 8415ed4e2269fa315203df66219a1f8593771ffbb0c79c7ba5ed0d9fbed89ceb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on compromised CMS uploads and a potential invoice lure. The embedded URLs, though numerous, are primarily on disposable or compromised hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/49bs5u5oopisghnuqqorlds9uk/sotonuwosuvasawekawenojib.pdf In PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16075a02e33230---71708928607.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/nnkgl03vip8as6lfuul9113qr4/toxojilidusepu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bf8aa0d31b9---6434514709.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/98842065229.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc65384e3---35025868879.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b303bc276f---69630249064.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/rinelorapofobotusuxas.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/741e5869fafe5f600af845033a75fae5/gobugu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0bc579f40---22443720218.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/tufabanun.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/fejiviva.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607458943acba---rilumapomatemisib.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/v5dr8rc1nfjnuoquj3ura6h6vv/subewuwazevax.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/5f5625713729b3090bd562755230f61e/wekiruzuxe.pdfIn PDF document text
    • http://matras-devison.com/upload/file/fozesuwavuvewilapinise.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc33936f586---11687640677.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/93145004067.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/gadadirumezuvatujom.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/945b254e3a99cd0433e9306ee235e72c/14346922242.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/goqhomag4a54bcuvqn7csf2lc8/92009344344.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/zijujisimoriw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=inventory+lower+of+cost+and+net+realisable+valuePDF 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_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 16900 bytes
SHA-256: e375c7a66044b43ce2a9436f319e74263a9696dedcd17964d23f68af8ffd6c63
font_02_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 10928 bytes
SHA-256: 1e52efb77be80d53076d2d68a4c04825a93c1b8e5792b83fbed97407b34d1f8a

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