Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f08d73e5b33f359…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 13:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 63a1cdf189ee656912823b70b25c12da SHA-1: 694cfba82572f7c669c05b2809e969ac7c17f2be SHA-256: 1f08d73e5b33f3592c8574e7a2aebf5bc69a1706416f8031a301a56f01e172d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae07db3ccc6---lizinaxur.pdf In PDF document text
    • https://badrivishal.com/media/rinimonaguj.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210815191312495782.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/jovodidowalananisevalib.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/23132705756.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/19683144556.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ri8etrdhl8b11v4vv1ag9vt5m7/linanijuxeseligenoxinunum.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd07e62aa58---8719584797.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4f1aae4d7fb0457201e1d73efe0c172d/sikusexerigemirub.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/vekikalokagamofapate.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/ferumudinapabopu.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/32590413525.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/tk3j3avnhsms01vv6sgiclje88/95490577230.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/0bp14iit8tq346lpommhgvp527/bovakazisaxijotisepigume.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/jonapevos.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/75690408911.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/0f91463bf1b558f5bde76e50512966f9/pesevovizanorulafunesa.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b975ffabd0c---93935354671.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210705232920.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/21578995574.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/rokalajojilo.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/rokad.pdfIn PDF document text
    • https://micsys.in/userfiles/file/2460528986.pdfIn PDF document text
    • https://hsse.cl/files/suwed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=free+assertiveness+training+worksheetsPDF 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_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 17516 bytes
SHA-256: 5d7a0a3368beccef53e0dc109831dda785ee672ff81bdefc4ec117ceed1b7633
font_01_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 10564 bytes
SHA-256: 5f97963b2c91f34ea4ecd0bc08cd0d4d7116c92b3b6d8f9daaff602236a69b9c

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