Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e6ec7ddaa83c45…

MALICIOUS

PDF

92.0 KB Created: 2021-09-04 07:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 63f14a056ea5563efdbf44d85bb311dc SHA-1: d0dae7358a1422f04e3bc67ca43a0b3dc66c4b5c SHA-256: e3e6ec7ddaa83c45f954421f6b2f0221290dc276510d37448cec0b2a8a477f2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests an attempt to redirect users to malicious or phishing sites, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/708c67728a67e70510ec8521589e0807/39797365662.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa96d76df5e---ralixarodipejuditerobogex.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/eeaf0e83c5a18b6c8c2d8c619273cf89/30828525258.pdfIn PDF document text
    • https://afayl.com/userfiles/file/poxozal.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608637340a8a1---41474706562.pdfIn PDF document text
    • https://primer-spb.ru/files/files/rujugus.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3ab387a16---5912157748.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/33977401200.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607416d8d9cee---suzilatirijajeluveg.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/perona.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/31541852276.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/14569786639.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082eb60b43b1---vomiwesalenixajodozizex.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/ferevuworasisu.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/82246821610.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/67430937537.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/90296476806.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/63993338224.pdfIn PDF document text
    • https://digireg.si/upload/36047626973.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210713/file/16262094452909.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/rojuduke.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/86a00c31e2dfef8a460e2ea4cdde3238/lawuwizofed.pdfIn PDF document text
    • http://novichiha.ru/pic/file/foxegonifijuxemenitome.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6kibb7tep7pj55rgafk5h3js4v/konoxakatanijuxoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=arranged+marriage+books+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_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 10908 bytes
SHA-256: 2aab77e9f70bc4fded0bcc9094649f3ad1417e1e11b9c9b2d0fd8762f14eac2d
font_01_sfnt_off00011833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 19784 bytes
SHA-256: 8b517e6d8264bc1d920801a1f319949ec57958437abfa47d805cf9518b87d1e0
font_02_sfnt_off00014a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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