Malicious PDF — malware analysis report

Static analysis result for SHA-256 721d1c30c21454d8…

MALICIOUS

PDF

84.5 KB Created: 2021-08-17 07:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: dc83e613f914c5805d33dba75f7a97c0 SHA-1: 0666145cff9f9f78daccd2e7ff935a6533e6e46f SHA-256: 721d1c30c21454d8f477616d7fdac048c3fb85f5eea5a225087e2497d78a410c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites hosting further PDF files. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further stages of an attack or to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8e0e44c5d004db08b71e01a99b34a1ec/96273179355.pdf In PDF document text
    • https://italvaping.com/file/zasewakugu.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c566466f0369093e3911c5cd46194b33/degamotabogaz.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/8opbgtccd98cpiqsat4g1nif3g/siviz.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/tubexupemovekuro.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af90cf1cf0---duvepabuzidifogidet.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/zosinisalijepekopugixuxaz.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116d26e5727e---senebimukojexamugapi.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/58552330375.pdfIn PDF document text
    • http://rurisnet.org/images/file/bezegoterotezabapevezem.pdfIn PDF document text
    • https://cristalensi.com/public/File/74091270505.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/86320992239.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/57376816854.pdfIn PDF document text
    • https://digireg.it/upload/dodozowamavalejalukafose.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e61bf37f60afa2ca70b1e95279ebe884/lexumamupimoko.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/mewibobil.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/50417733202.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/uq3rrgiomr66d7pe45bn4caqck/67757101491.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/60188050949.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0452931193---72802725642.pdfIn PDF document text
    • https://ahha.az/userfiles/file/61217006234.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/fibijifupujanuxik.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/zovamukedijoxazegonizibu.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/sopajewobalefeligaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=diccionario+de+sin%C3%B3nimos+y+ant%C3%B3nimos+en+espa%C3%B1ol+raePDF 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_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 11132 bytes
SHA-256: 5e2ad0f50e79ed59cd82fb39802bcfa41f352259fd880846e2d96e8e5505d659
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 18344 bytes
SHA-256: 504bd26640775b7711b3cf602c0eb97323012f0ed684a0bb14314d99bc7eab33
font_02_sfnt_off00012886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1