Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b565a532a28d72d…

MALICIOUS

PDF

86.4 KB Created: 2021-09-07 07:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e37af78313742fece2f6cfa9545ee866 SHA-1: b2171bebb04e3177460fc24c772e4f1b735574b0 SHA-256: 7b565a532a28d72d202c5bfa0d01b9595b21d80999788a1fb0196bdf20113104
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://hesexpo.com/img/editor/image/file/gumubadimiluwelajibazat.pdf In PDF document text
    • http://chromavials.com/d/files/nawuxolapewipazemug.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/simuburufojo.pdfIn PDF document text
    • https://led7.ru/file/85920281266.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/sabanijegar.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab4dd3b6c---lajeruzajozedus.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/6d0009b2ab0b0b5fffbfe35ab0c52184/17718143116.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/likoz.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/83066305466.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/77731958614.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e125bcd7d---momozifibikejegikufaxa.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/66342318592.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/26986007869.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/kaninoxeko.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6f2b063af9f8e4bac7dda6c61afee359/20362613147.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4123adfa1---duxev.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zosexixivuwapopipobuke.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/19482791887.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf226e56758---49885784450.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/46467370120.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/revepawifivub.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/sojitujitexatodaro.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/buwirasimoduvowarovivux.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/4096777778.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/65119064079.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/lovipekodowalanasev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=full+wave+bridge+rectifier+circuit+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_off0000eb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001033e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 10772 bytes
SHA-256: e363733969639a1eb6dfd534fc2eba7c73caecc6e22a3f3a06d0119e1acfe0be
font_02_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 18280 bytes
SHA-256: 8e4a1370d7579858666ba7bdfd948907134cd48b50bd4fe22817ad31eae6f396