Malicious PDF — malware analysis report

Static analysis result for SHA-256 e471080e3bd16af2…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 22:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d60c0d56532e23fb297c20eabc6f8022 SHA-1: 99b1bdafcd4864f605a25a1abdaacb4469d406ac SHA-256: e471080e3bd16af250b3b96a922786482cc98770c465e1da5bbbf05da7bae70b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://ilovechardonnayhills.com/userimages/6348796721.pdf In PDF document text
    • http://ilovehikari.com/uploads/files/wivelipopizuzeborozigu.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/tapijuwoxumisilege.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c99c81ac90---zakidup.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b768cb22455---vuxov.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/mejuvoko.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/l1v52p9r2dr9aaavbuhfpp4hlv/migajafuzulopodenag.pdfIn PDF document text
    • http://citty.org/images/uploads/file/kupawamusekoxuz.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/gubijofukujisixol.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/33828741864.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/5ec9a31f63bd71fe93e08aef0de8c171/47184456461.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/fawozonuj.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/babiporofiboget.pdfIn PDF document text
    • http://stromzeleny.cz/file/gurasesawirezerezegurij.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/akf9d37bi7vpmrhgacigo88n48/78821767730.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/52172838282.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/seneligerud.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/wegisudixewunowunix.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/815975885.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/954b4267fa7f5c6d5bea9512772aecc7/jinitimuxeruwene.pdfIn PDF document text
    • http://labonscafe.com/userfiles/46983294062.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/44fb14821c5b5f5d0c4f9e4eeb0d6897/62750140137.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096525e0f11b---30717628140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=rfd+01+form+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_off0000c3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D9 10076 bytes
SHA-256: a464f97610ae279590c6c12317af659a6cdc6238c7a6eaef6a6b90bf5733f56d
font_01_sfnt_off0000da3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 16712 bytes
SHA-256: b31b0dbb9b075a220de03aa327a23d3bc8707ac74a28a610ce82e8870917a18e