Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc85b1a43ae1bf7…

MALICIOUS

PDF

89.9 KB Created: 2021-07-23 03:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 996b0f85ba93fddaf69cbf73cb610493 SHA-1: 78ae9f3b024f2797cdb79bcd0cc63ada6d2137f4 SHA-256: 3bc85b1a43ae1bf7330ca9bc6a4499ba7bde2c7211eb04d3501c2ba24fdd5a23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89de94b0f---21887197144.pdf In PDF document text
    • http://agnieszkapawlik.com/userfiles/file/zabuwimepuseri.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/152ce7699dd25cd64c9f6b207308c0b2/44978662003.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d996f7f1c2---82410553878.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4782a11feb---xuzokuragosa.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/nerivewujujepotakavoxib.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/32862924837.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/repewigamapawobu.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/pedos.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/sogozok.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/kigolenewakovubelasuri.pdfIn PDF document text
    • http://www.asslar.de/downloads/kowuj.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/bebovalesuwinixukogu.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/61741683485.pdfIn PDF document text
    • https://olterus.info/contents//files/39494236433.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7f7bbd4baebaaf735722bcf4b5841883/xogudefanut.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/19828307346.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9be032f7e11e59cddb1f9a4f79d250fd/doriwa.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/pediva.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ce50a4016---49233995840.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/zilab.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752155aebd1---28168578837.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/nunerosaxepetegu.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/26766956920.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/bafosoris.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/zimadagasaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=questions+in+present+simplePDF 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_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 17092 bytes
SHA-256: d9acf6ad82dd77a37fa0da86c0aba3fe92fe98907c634723d438e760e04fdee7
font_01_sfnt_off00012936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12936 10412 bytes
SHA-256: 2c413c902c7847e898003baa63761aa9fa84b6d4e9b8d54c516fbe5bd76d0234
font_02_sfnt_off000140dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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