Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffbd2773c5bbdac…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 21:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad74cfe135a3307aa8cae59625e876e1 SHA-1: 217de615e4359ae0e7a5687928cdfd39f5648517 SHA-256: 4ffbd2773c5bbdace99a6ab19684a9fba63f71ec255e7d5a4f4062a574a4aa2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content, potentially via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46654ba4b5---doxiratelu.pdf In PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f99c798fc18---98133004325.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/digebu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9518c0631f---89121252773.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/59357757416.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/29510848981.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/92123928963.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/wobekogifikuke.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/51047852991.pdfIn PDF document text
    • http://potlista.com/file/files/simemigudezo.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/32190253473.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/nalafosigude.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cb47ac1f459---2269152614.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/124c0e9932e510f35c915749611188a2/kepozusadakozuve.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a79cf89a558aaaae572ad3a64a9faf93/5337844134.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161025f685fc0d---dalilixodaretijodod.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f398285f421867b0d5e1a6f66cb8a506/75402785596.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b52bbb9883---javavu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4c99df2a6---zepomolomovuwenidejof.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/5ger4lho6p8ijp6ag3v8bb753f/dezadapetutazidaw.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503191522176.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/eb7dd8e4a4719b4a04d7f2a83d01f1bd/nilumamimexabarij.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cab5ddec5---66187135464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+triumph+of+surgery+class+10+question+answerPDF 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_off0000e5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D0 17260 bytes
SHA-256: 5378ad5aa21fb3f42aec0cee110694d4c532b48689b03f6f16d4ddbf3679b65a
font_01_sfnt_off00011212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A29 11512 bytes
SHA-256: 455738c551a7a1d03d024bb531ab5212a9029fd2b4a578bb4aee2d4a107c2479

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