Malicious PDF — malware analysis report

Static analysis result for SHA-256 191fb36ea4f4dd85…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 01:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a23a83ce3ba2560be77b478d63d11025 SHA-1: 279db02cca893296ee823ee5616932524ada9605 SHA-256: 191fb36ea4f4dd85c608280de485cd191e313eb1d49e0494c20f0b1e98cdf639
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other potentially malicious domains, suggesting it functions as a link farm to redirect users to malicious content. The PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4a3797ad---42511980999.pdf In PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4088b3616ca6f2229fb108a04f1fc4b1/75654252787.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/lumibinukekefo.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d7cfef192---gojadar.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/10500327103.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793e9a2bf55---rikizikexekalab.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/nuniwemepeledune.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62d04ee9a---85849584789.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/12474884484.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/73482958179.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f309539c6---togavuz.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/xalivos.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddad7027f67---zagapavaxi.pdfIn PDF document text
    • https://thehouseproduction.net/file/85891224777.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/demarizunujulanin.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160780795d66d1---94652802079.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/fozorunepigukisude.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/29364663656.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/rodugapatedesazexigu.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/wobelivigiwirepelusiju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3641a08fbd---16691648339.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/38128777872.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/5767127827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=online+ppt+to+pdf+converter+free+downloadPDF 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_off0000d29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 10620 bytes
SHA-256: df934e46c96393527b335cb81e73239fa69fba5a99ea699a83e8c4989e5f2690
font_02_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 17640 bytes
SHA-256: e4572d4fa9c5aaa0e96d50a4f55579699e236f46141a6e3adc5a8627fb615d34

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