Malicious PDF — malware analysis report

Static analysis result for SHA-256 3877fb9d39b1acfe…

MALICIOUS

PDF

67.7 KB Created: 2021-09-04 04:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5bb87700232b1b1a5fb0815e89539384 SHA-1: c2646a04a85b7f5826c56f77a7524bcac5948fb6 SHA-256: 3877fb9d39b1acfeeefd003459f538a63749bac137a1896fbd3f19a81d806507
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and small file size, typical of a screenshot designed to hide clickable elements. Multiple heuristics indicate it's part of a link farm hosted on compromised websites, aiming to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://advik.net/userfiles/file/65287191581.pdf In PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b114593e8a165db46710a178d3802fe5/kurubokidugikomumuzobibep.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/banixodug.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf41932dd---6780576254.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/niwom.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/rovegajebi.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/p86su20p4algvu1chdvi8l7t17/powixupuxipawixigezamepa.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/metebixomose.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/21435785583.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/fufevojibazabumifokenodul.pdfIn PDF document text
    • http://anpo.vn/upload/files/83244949733.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/23004293886.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/vapawererufatiduranomix.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/67467489143.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/76977809856.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/356aeec3aa7af1ce93ba3520af1cc240/25778444183.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/45034549049.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/75544614074.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/91970517955.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428120341174.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3518f51b9618749a67de1e70f3beb152/45668620640.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mlrrldsck6vkplct73cpi4ri13/32086659324.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/zodakopaxoguvikozej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=basilea+1+y+2+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/31693526767.pdfIn PDF document text
    • 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_off0000afb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB7 13764 bytes
SHA-256: 27115dcaa7c2d568c659e583953bb29af8a1672765b694e035d16f2775252b9e
font_01_sfnt_off0000d1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 10408 bytes
SHA-256: 2818f311d1ffa4485db24ca84582d8a51aa10b7919e994742378281969656187

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