Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d71e37cc2636622…

MALICIOUS

PDF

85.3 KB Created: 2021-07-03 15:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 783800bb706a1fab37c219047d190801 SHA-1: a2310e32cabf87af60b64a7961a88b62a21767e7 SHA-256: 6d71e37cc26366222fd2e1bd9fc5c7a0140d86d39576347af79b9900913cf0ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload directories. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary function appears to be redirecting users to potentially malicious or phishing content hosted on various domains.

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 http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c575db8db3---5962057578.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/0tm195bbidvgcgn0phv4e6ko2v/pebebujazezavup.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ihr3gmbcblo7tmri2kad64hv5l/504270258.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8r8gu09mj5st93fcddpqbvov2d/rexalawewovevirukuwuviw.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c1b0c9a9---pututawuriliserirute.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/tawimo.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073717c70910---83477409290.pdf
    • http://archerelectricsupply.com/userfiles/file/buromebasos.pdf
    • http://mikailang.net/userfiles/file/20210514161715_1357605771.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607887ec2a8e0---7967167632.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd1c1aeb08---vakaloxebi.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b86189bd985---4229554219.pdf
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/wemofunuxovibesunilofodo.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f247b87fa---temirosevuwezatak.pdf
    • http://timandlor.com/userfiles/file/87451071672.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16076915611c11---91795961399.pdf
    • http://haphadoor.com/upload/files/gibivifadatamirumoniw.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/10486665528.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6880b7016605a6d62c158cc55efc3305/pivifimizemaxukesebixoku.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/a37f462ad189187a372a732b6055ede6/fiwodojawa.pdf
    • https://actor-conseil.com/files/file/tawomiruparapewupika.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/gg74sn5cnqkginfp7ae83qcr4e/pagolosukuwudow.pdf
    • https://bataretak.com/img/files/file/bujulolegodaxafezegosoxo.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/13204541115.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c58a466bef3---xajodaku.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=lincoln+west+golf+course
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c3.bin
c2e8de0c1994dca3d5d484c411a1799937c20aca259efb23d18917a34f06a7cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 10492 bytes
font_01_sfnt_off000100d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 16792 bytes
font_02_sfnt_off000118e8.bin
ecf3703b5542b4451c45c2d651a1b09308283a87c6ab371df60ca09e38ac62e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 17872 bytes