Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa29a0c3f21c3b5…

MALICIOUS

PDF

88.7 KB Created: 2021-09-16 15:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f64aaef52d2c3d54f3e3a6ff7b39153 SHA-1: bf1dfddf43130be9b3db3b4607a2ae7963f92662 SHA-256: eaa29a0c3f21c3b59bdfa0eb8094ea79c10286995db3b64e8ab1e49d1d883029
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic and numerous external links, some hosted on compromised CMS uploads, suggests a phishing or malware distribution scheme. The document body is unreadable due to the wkhtmltopdf authoring application, but the heuristics strongly point to a malicious link farm designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.pirac.org/wp-content/plugins/super-forms/uploads/php/files/07332792096df1b5228ebc75ed93971d/kovemetunabesoxebinusu.pdf In PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210909_BD663A82BC2AFC6E.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/munefevezaj.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/17931432729.pdfIn PDF document text
    • https://defi128.com/userfiles/files/6479288149.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/pawaninorixidinisepawo.pdfIn PDF document text
    • http://allasclub.com/campannas/file/66614009728.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/18026673144.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/17367980236.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8i9cfeqrtvc5dt9765f8orcf1s/tuzekedefewa.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f939a14b0d---8351735972.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/072054032709.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/kusadam.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d661a6b6e75c41dd34b8a1cb51de0c89/lavukipezumibak.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/33730499217.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-4/20210904131634837175.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/gapogagu.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/tiduduribodades.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/26305215105.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/59902912457.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/daxovoxilobinozakes.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/40518435092.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/sedebowopet.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/fawusixijazevev.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/sadipagunap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tutuapp+old+version+apk+download+iosPDF 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_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 10692 bytes
SHA-256: 7cf897b70bbd0cbfee71e4d819030747554da4ef4511e110a1d0c36f9601ad58
font_01_sfnt_off00010cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C0 18316 bytes
SHA-256: 9ab01ee6cf88c1345755558abacb50833e2625678e7be08a3e9e1a8883e8786f

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