Malicious PDF — malware analysis report

Static analysis result for SHA-256 c405a7f11fb6486f…

MALICIOUS

PDF

77.4 KB Created: 2021-09-03 17:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 170f96541278f3ce699a6047c9cce965 SHA-1: 60ad7b952fa5509477abe7a977129bb9ab52df00 SHA-256: c405a7f11fb6486f99e7c87c66e3820b275b48c0d5637bc525b5e859339c9c5c
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d62cdea2eae---43756182267.pdf In PDF document text
    • https://bawwabatrizq.com/userfiles/file/sarujomodesovovuxox.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b3de6b064c---kemibimagibifelu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8d029fa1d2a6b78550fdeba4ccc84ca9/87039983693.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/qttvbed05jb2ruj1m3di3e2o8j/20979275708.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ukhb0g8pii0ila4r6i98iagfs8/56489363224.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9b52jkvrjjibjuruah0a54d6tc/28970234570.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/banomopezu.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/85998724918.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/laturufawib.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-16/20210716041446743664.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210804081231.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/biwun.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/97359798544.pdfIn PDF document text
    • http://haphadoor.com/upload/files/dizajaxulapikuruvafegu.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/kotumovivigiletowerijigib.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/81882448903.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/36cnehtebupfv91achhr6inmou/90701791611.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4cdc3174---sapez.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/letazuxudumelarokilazudiv.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/29614780366.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4be6cba2ffee4cb850db84e934c7f163/63551989178.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b93431ee---tineramanesuzap.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c1a27f84b698e419eb1c6d7f8071007/fifigotigewafetoxuna.pdfIn PDF document text
    • https://ethnicacademy.com/userfiles/file/leveseru.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/83995449411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cultural+hegemony+pdfPDF 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_off0000cd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 16296 bytes
SHA-256: 39a3ed7994f5cad7c0045435f255aed638ea2de780e2dc01bea8c99f31cbbf6b
font_02_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 10932 bytes
SHA-256: 3a1fbbe46ed12311a2983aa68b95cbe8ff9395656a6a54164163b452d9c71bb5