Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e7817ca3de91ef…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 17:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: e17d8103f377e1fa24f15ff619cc5b43 SHA-1: 5b3a6bb2dbdbd44a65c80983840bd7cfe2e56b49 SHA-256: 72e7817ca3de91efa137b872e3d0ea4b2a4dc76f410ef46e4e54e60ed20cbfc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external resources, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or trojan payload. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0442c8ceda---80603587850.pdf In PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/simalex.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e5267df125bdb2c2343432ff99d4aec9/nuveliravugaruwaveru.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/53452221324.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e14820122a5---57952306572.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/51584709085.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db5067ac18---6914404273.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/difalimad.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d80e85cc6f0---27970578367.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/f86803fa820c8774d91f3e5ea83b471d/venun.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/bujagolavatofevububirago.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0d1c32e6---xesoverexevemoxibidu.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/76483423128.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a75a430b322---jegewezakusubemekalikaxo.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/64340477300.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/pepakigibodeluve.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/23913560888.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e65d72d8bf9b73cd1ca59f6ad80be45c/11934252253.pdfIn PDF document text
    • https://bioesteticaonline.it/file/43476986961.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210810_D36C9A3E6689A357.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/mezadifurexasokufe.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/46276638656.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8d5676fcda07ed9f9e016cf508a3a96a/80375409479.pdfIn PDF document text
    • http://techbis.pl/files/file/bejakubewulej.pdfIn PDF document text
    • http://synphabase.ch/upload/file/38297155215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=le+tamisage+pdfPDF 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_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 19624 bytes
SHA-256: 19c46f072de0b26c76466d16b24c497d747fe4374f8dd6f3986fdba4a85ccc38
font_01_sfnt_off0001108a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108A 10428 bytes
SHA-256: 2466438ef9e457529dbbf5f5130d033948c8465c921d9f9951a002acd7a5a939
font_02_sfnt_off000127f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1