Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb787b02e2d656c6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 14:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5a723dd155961ee5010b15ee1b620d0 SHA-1: 4e6907f2ed9b339727a24748e534a5beac8e915f SHA-256: cb787b02e2d656c6804f6634cf5edd3202a150571e0602880ceb6f45753c3b0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm with numerous URLs pointing to potentially compromised or disposable domains, as indicated by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://simsvizag.com/contentimages/file/34826350743.pdf In PDF document text
    • https://idroilektriki.gr/files/file/wagorupu.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/19899552077.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ub9eganksd0sq0004eho33pq7o/rilarugunobimuj.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/51402638337.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/dubuwudiva.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/90dec04a94d2d5d647f596a5368e09db/dexagasufesere.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7a309f8e353ec56b8d172a8d360de4a7/57286747605.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/6920cbae9983a28e1adbe52107141593/ropegone.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/mifebuzovosatodize.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/687702500.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/82510004884.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/52cr9tobgsog7r26dju6s5j63k/40991003158.pdfIn PDF document text
    • http://moristas.com/userfiles/files/pujemijoxivitefizivaji.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/h4ru46o9o1ml1erki3lf8m5su7/31261357181.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/dojorexojibifug.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/34265709338.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/xurerewaberizefa.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/11635938563.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/86929344461.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/vidatezedotile.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ffaa58a4f---27931692399.pdfIn PDF document text
    • http://apart1day.ru/file/41457921206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+play+store+app+if+deletedPDF 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_off0000d71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71F 18012 bytes
SHA-256: bab9b7710cf93dd11881124dd7c3c738f633781adcc22375b969f1960d50206b
font_01_sfnt_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 10760 bytes
SHA-256: 089844ef353eddbf9c5d67ebed5c7e85eb9e81e5847f6f4f6f4ce882f9a7f968
font_02_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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