Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1290c96acddd09…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 03:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5da6fba83eb658d9676ead05288e3985 SHA-1: f53cc3830678269f5a6f451017277802ead6949c SHA-256: 3d1290c96acddd093f4b8ee861db7c0409f494927248c35527d1ce754fa57046
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary purpose is to act as a link farm, likely to distribute malware or conduct phishing. The embedded JavaScript suggests an attempt to execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133df8b3ce67---vetirabubafukobavu.pdf In PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109020938079958.pdfIn PDF document text
    • https://braus.uz/images/shared/file/kefivaxiruvefodarojo.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/95723199564.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/paworupizejuduwozaxol.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/9ffa17d0356192fdba81022e34340e39/wizulegoma.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/76856331709.pdfIn PDF document text
    • https://palet-school.com/files/files/46508804734.pdfIn PDF document text
    • http://olympusflights.com/files/files/japogiv.pdfIn PDF document text
    • http://agilesolutions.in/uploads/1032081697.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/wisizasazomonorezijux.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/35252277749.pdfIn PDF document text
    • https://ip-pharma.net/data/files/nolafaxedakoke.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/n0upbjl594jt3kdfphdlsu4ck6/xuxeriwefaligo.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/savibulanuzajap.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/68475103382.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/65547648388.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091021162663.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142084f480e8---motomibumirivabupak.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/12934945517.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/xukunew.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/pufivejodepupurimoxif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=torq+cloud+gaming+pro+apkPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/59485848772.pdfIn PDF document text
    • 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_off0000b92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92C 10760 bytes
SHA-256: ace2df68b7cf761e4ddb52ef63cb3748587d1080067a5576145517860c21c451
font_01_sfnt_off0000d149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 16108 bytes
SHA-256: fa072360293e3c8d8e6b541bc8c339c121f79846035769713105921fe00c2584