Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04f73fb7bfe64dc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 15:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6e666e09ea014c7a63793a09e5a29f5e SHA-1: feb1d885744f7f6c3c18022c9b1e8cf47af853c6 SHA-256: e04f73fb7bfe64dc87a8357ffc58d6e57acc2b7b9c3079621797cc39c49dfb15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/21044d5d3c68fa53b1f15cd61bd6ce05/54636326247.pdf In PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e25646cd7---96242767929.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qa0h2b3h6deet23ije6ns05tv2/4947845375.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/39286158540.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/dutikatowexegavudubi.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/siwafigesaxetadogoku.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b6777c51---zorep.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2fa36a329161270b93a5df572166f007/50232345709.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/94869106706.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/59633367166.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609895e9ab794---57755896300.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160915fcaf1042---87560314073.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160756831852a8---roziretajegosolurer.pdfIn PDF document text
    • http://mobilenmr.com/files/files/gupexow.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/zelojupe.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/f31439a0b98522ab2e84992a164c0353/figirenaradux.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/votelovoxetejinuperilo.pdfIn PDF document text
    • http://slovoveri.org/userfiles/jajoxub.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1cddfd7e44e7b45b6bc60ecaa6aef2c6/pidamupaditebaxawi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e91ec7d501---fepowisulubirusijiju.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210730190105.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/28767703835.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b7408efa6be99555b555127a90294f5a/93591260240.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/bawiriragatokajopujuje.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c923160f092---minowuzog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gobernanza+territorial+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_off0000d72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 10564 bytes
SHA-256: 2433bffb9e3a372d26314013c4f90a44e73947ddd35cec77b754882e36ae56a9
font_02_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 18988 bytes
SHA-256: 68c2cc96d01b40e90a38f544657dadd03aa97cf2a486c6dc26e5fc0e537117a5