Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca948b5fd9f3620…

MALICIOUS

PDF

88.1 KB Created: 2021-06-18 13:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9635843cf7e256a66b21f60a9d1c3c00 SHA-1: 081c8cb45b0c6eab37b5e414b7a6a3dbffb807b7 SHA-256: 3ca948b5fd9f3620d43e81a189d149863ccc1376f88e3ac5b5eafa4f0b9a4c2d
156 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to trick users into downloading files, masquerading as song downloads. Several heuristics indicate the use of compromised CMS upload storage and disposable hosting for these links. Although no scripts were explicitly extracted, the PDF structure and the nature of the links suggest a phishing or malware distribution attempt, likely involving embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://akinmedikal.com/uploads/file/47235283586.pdf In PDF document text
    • http://mousike.it/img_ins/files/51133462102.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/sulenumevozudaxepijagan.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/a63890f9165583a4385fcef88e381b0f/82807783715.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a536801d0cab1e93ab4c61be48103d3e/90908076933.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/60523414006.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/34645639338.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3e44228d7---94763782452.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c684fa962d3bf57b039f011e585f2ed5/51096230167.pdfIn PDF document text
    • https://edbcagliari.it/file/fakutojegasukozuju.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb6034645---diwigakovobutubinu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb05dc50ca9---5499678800.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ec9c42acf5706cbdf22b389cc276be0/29511204777.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/mapalovolejotapuledosov.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/fisuboviketofokozabeja.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2183df62c---12932806281.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+songs+of+roti+kapda+aur+makanPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 5516 bytes
SHA-256: 7ebfd5a23efcf871a5a75708f855a21a4d3a61e3a1f992b03179aa3cd789381e
font_01_sfnt_off00012e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E40 11244 bytes
SHA-256: df275b0966a283272efff9573a945bd484db8cd0fe1d4f815fa9747fab33513a