Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8dc38ef9581989…

MALICIOUS

PDF

77.5 KB Created: 2021-07-17 14:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7057a14ebb7aa57f59321083b8a45055 SHA-1: 1818dc34b5c04cbd583a6790ab65708531175242 SHA-256: 8f8dc38ef9581989a4d3c09faed0da7f5291abd612bfcdf195b790c7b3e87fb8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c157d779c---fifefix.pdf In PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/819a164c03aa089aaf57710937084f77/lotaf.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/wuwisubejitalelivagoruj.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/natazatedubolavomeka.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/45174641352.pdfIn PDF document text
    • https://ancoraeducacion.com/images/88339803691.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e5623bda872---61584734542.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210524135137.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/fukogadibivarajuz.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/sutidino.pdfIn PDF document text
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/84964568850.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/zomakegorume.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/suxodenarezepudeguwo.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6238da5fb---fotaxowilabit.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/bavapilesixow.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2f39a725ab7dbb67ca859dc83298acff/19843243279.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c38fbc0b5---lisev.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832eab3339c---zifuwuf.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/bepisefulamo.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/gusejas.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/lanafefisefujadofis.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/8857da63801c3b9590ea37f3df260193/33678989421.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/xugabixazidobopopos.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6d5b17b4c24a1cf107f8ed1e229287ee/10615011092.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d6dd5696eedcaab795392c80a412f670/51647073946.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/92504132245.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1efc9e715a---benibawitirinat.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/lisufakitusatemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=beer+vector+mechanics+10th+edition+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_off0000c9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CC 11028 bytes
SHA-256: 31f8278f611007a7d66be9cfaa6325f3ae19effed2735135b40ec064ebd66aef
font_01_sfnt_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 17116 bytes
SHA-256: 724e3f9de740bc45f343f19e58c55afab178fcd11851e82a5821ce497679c961