Malicious PDF — malware analysis report

Static analysis result for SHA-256 3755874e926b3134…

MALICIOUS

PDF

86.4 KB Created: 2021-07-20 04:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9569eca25642a477544a8f5b10641d2e SHA-1: ed2e1b8e02caa76034aab2ecfe3d23a2ebd45a6d SHA-256: 3755874e926b3134633c7d6acea09c8625b6b68906f3fdc19256fb1c62c7af2c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/gb6hcj0s3t40eet7f8utign9rn/49550528407.pdf In PDF document text
    • http://yjccnc.com/upload/files/wegepesareg.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/suzapo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/smd50hu5l8aav703p760non2o3/zupogekatepod.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/85528b1dca3c3ce5c29570ef0ad2f8ae/92026053396.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7f6p7ai0po5hpc43gptefhi8md/dowipebikud.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f9614c8bf---65288038638.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac56659f313---lanotu.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/ccd7b2be0aa1ce149df478414964bf7e/gusoxudamotavoxe.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/higbi8t8jnqihr1721bckq0vb4/bajedido.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/22c46f8a8fe1b054b76dc5648dff4cd4/26033104911.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc3dce29cc---kisivoxuvuku.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2df2da407311816bc030ac52ef2f0ca8/24967481069.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/8632ee35d18aeccdbb3d5c6ca6773a4a/78962677434.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/68369991789.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/32195306247.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/icn35floeml8nk200it1atmhhs/worolagebimikakalef.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/ruxasemidab.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e103d117a438c9a46db9646dc2303d90/xijufakeb.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde1b1e18c---63646851772.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/3b9602bd23c775aa8e292f751f4fc14d/25809288645.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/gefixivodozobidas.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/23404038930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=como+usar+could+would+shouldPDF 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_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 19020 bytes
SHA-256: cfe841cc270f02f8d545042fb51c9187b8694ec6d760a4c938d71a09c37b99fc
font_01_sfnt_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 10428 bytes
SHA-256: 92d9d978ebc647b784d65029e7705bc64cfa968bd74f15e14afaf8f058401bd6
font_02_sfnt_off000132af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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