Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a64c867e8b9d95…

MALICIOUS

PDF

75.0 KB Created: 2021-07-07 10:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d827f6b5ba60a9630396f75dcc78320c SHA-1: 7b9ee019b36894529cec3e90f5a1f62933291e5c SHA-256: 43a64c867e8b9d951977d73998b808b66163fd207daf25109a132434f0626ad7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous compromised WordPress upload directories and other disposable hosting sites. The embedded URLs suggest an attempt to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://aashianarealty.com/file/supemerudoponaduvokudox.pdf In PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/finubumamobinagabam.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160be60740ffad---18446199054.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9442d56fe6---pixilazu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6038cb6bcc---rigowugojopodufir.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d15853c8550af9406b578f4066344fa/29916819048.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4604664cd---zosipadavoxijuke.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a18580e84423aa2f04ca4da6d670b343/43590483264.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1d998d46994a12e0bd3d0419def30682/nubafumel.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa66cb8f5f---6339304728.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/tidolofobivinibaxakudovop.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fnc8lemng3si64f3palg9lkvpl/kowaki.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/jimodumabogak.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/986564f97a640db6499108d1bfaf43e0/vewilidetixetosi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdbfb03efe---90951105838.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/tapukaxepunukil.pdfIn PDF document text
    • http://envigest.cz/upload/file/50909629854.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/10781712429.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ulos3mqoc4d5kmo61p62cpo5ea/somufakika.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/ligor.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/lvov8rcfn3m3bn8neb19rtc0u2/2581345821.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b623a0e97---69763659636.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606feff4e2c49---fovanejuwelesixibenitila.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/66386688906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=integrated+health+solutionsPDF 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_off0000c430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC430 16520 bytes
SHA-256: dbbd8bc95b5cd88855a9b0f148744185ab1c9436eed9f36c0921e1919f0ff974
font_01_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 10580 bytes
SHA-256: f79e4103e55a682865e518f0ccc704446723b58e89d26ba7af71cf25f87aaee7