Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5e32c7bf228b88…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 14:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 37ebf6747bc50376a64c5df0517b9632 SHA-1: 7e23836e2f969a39585d225b24ac553427c765e4 SHA-256: 9a5e32c7bf228b8812869cc285d563ac6c40575b7699fd4ef2c2948ef85969de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of JavaScript indicates an attempt to execute code within the PDF, likely to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://dichvuketoanvn.org/uploads/files/warigokepos.pdf In PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/66224bc076fff536bfc12e008e25a95a/deromukur.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/pigalese.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/85fc520c5d466e058d2f0abcfdb80181/10945007426.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609852add3b64---xunebibagakur.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/worugagez.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/c0kbuodbksihp7impp92k4mr2o/topilipuwosekamuvelaxaj.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/kisur.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/polawe.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/gevigutolewafu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073437c2ed60---widojiletezaleruv.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f3113bf3432d6024787e749dd98328e7/28386193326.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/mikavudimodowugapija.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b579afa9b---xiwigoru.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f8edc3982546c61422a26a3288cf54a4/rirejumaxupa.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/zibunifamafa.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/musowujowenowalefegexajo.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/fie65m8hudv00qhqf0j7b4viug/moxinazinazutotekef.pdfIn PDF document text
    • http://limoride.net/gallery/file/fifivepedufuweg.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/427168560.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/fca522042a44a292479f51aa6895ac6d/tigofugagefo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b732ea3c51---43907868909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=activities+to+promote+language+development+in+preschoolers+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_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 18952 bytes
SHA-256: 4ba434465c7497b4a073c54ebe2775009400337f809027b63386700486b188d9
font_01_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 11212 bytes
SHA-256: 1bc8975a43cbb6c84b90f54a46badc0ed8b8212f2960475495d4377d3f1342f4
font_02_sfnt_off00012aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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