Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bef47fcad011c0…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 22:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cebb8e72103f41d8e1a88312a83d41c2 SHA-1: e7f3ad8d8d79bab6fe1d7aff6b19dd116c5ad6b8 SHA-256: 57bef47fcad011c0ca6319c68bb9b5f46c613af8e0c19713c6f898a8a43de361
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead users to potentially malicious external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://loonbedrijfschimmel.nl/userfiles/files/gerofoxovobafupimuxoku.pdf In PDF document text
    • http://artemon.nl/userfiles/file/2283361263.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/vopemorizuje.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/lazefuz.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/89750022629.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/77101282651.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/jamogojeje.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/77395265208.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa2399691---gedokelafagofeso.pdfIn PDF document text
    • http://specimport.by/files/files/40751773554.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/jolarugikegolifap.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/88594645994.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613657d77e768---kitizaguwagereladivi.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/4702306995.pdfIn PDF document text
    • http://epicridesnepal.com/files/7123221282.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/14864403016.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/89287588939.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/74761682167.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/sujubafegisareporobu.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/sopizuwofagarelufifedebe.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c07eb5b44407f4f084a9ca947c92e35a/37160878487.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/gotepifobapalumifiziwexex.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/47624802280.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/xuvunasanuvitiboji.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/giwofinilizafopaxax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=p+se+pyaar+f+se+faraar+full+movie+watch+onlinePDF 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_off0000cab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB3 17424 bytes
SHA-256: 8224f648b7d592426c015888d4618b6faef92e2109006664404d4274653db3c7
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 11112 bytes
SHA-256: 099a82deecbb9b2d000c4d2a47a80ea5f390fbd72ea827f08ad7796c364aa440
font_02_sfnt_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1