Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2bf209281e668d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-10 19:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de17df0891c57c663bca6bfb9c854238 SHA-1: 5c77350c943a34f014b7714231e8196d0aa77b13 SHA-256: fa2bf209281e668d46a9397c1df6192a920fafb9cab1a1eb321a5f8b4896a873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting. The embedded URLs likely serve to distribute further malicious content or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613005eed6a98---josiwovawizarefaxoka.pdf In PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sepafoziximutosefebab.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/71415306181.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/63893022160.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/72074120349.pdfIn PDF document text
    • http://anpo.vn/upload/files/62200870029.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/fofutazetatemifoju.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/pofene.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/dofazezisiw.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/gixadiwudevetisisajifosug.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/754935bcdd4485eec1ef0c20f05504c6/xejesulapodubigogenu.pdfIn PDF document text
    • http://ifap.it/images/file/90207406100.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210902153838.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/juvevagapevo.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/577486845.pdfIn PDF document text
    • https://dhesient.com/media/gamupuzafoluvazefopiva.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/89838022652.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/72901759680.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161309489cd83c---36377907525.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d23d167b---71361553136.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/uav7pcqsktldoevqqp38u6b74o/98392196580.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/xubanimorule.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/91968040520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=horror+sans+bad+time+simulatorPDF 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_off0000c941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 18884 bytes
SHA-256: 21262425b0d5af0e7bceeec39087345a1c85b04bfad1057a2506391d71e17518
font_02_sfnt_off00011318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11318 10640 bytes
SHA-256: ffb84bec426159ffbb7e8a7eb402f95641a8dbcdd61734e2899fd04eef6b6150

Open this report in the interactive analyzer, or submit your own file for analysis.