Malicious PDF — malware analysis report

Static analysis result for SHA-256 271e1d46a6b4349c…

MALICIOUS

PDF

75.3 KB Created: 2021-09-08 03:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a0fb673971f469d33fbf4de5b3441807 SHA-1: 0dce4f307fd4d6a9a12c7e427db5801df1d228fd SHA-256: 271e1d46a6b4349cf0f04aa8f61bfb6a516f8365a774ed0a0abcfda029b71ad1
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to redirect users, potentially to phishing sites or to download further malware. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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://accesoriosalmayor.com/images/userfiles/file/lamomudarixe.pdf In PDF document text
    • http://gildiamasterov.ru/userfiles/file/dupoma.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/mujavol.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/99505666146.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7edd35ba6972e191af2a95265e834cd0/tamenaki.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/fcsejsm2d4d6ah3ndl5p996hk2/kagedufe.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/35623941189.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160989b55c9782---87112334872.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/8347995323.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/65557730561.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/zezigelosuwelalewe.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/30f3145a96adb7170f367e8e41785c2a/67083229621.pdfIn PDF document text
    • http://jsdarvin.com/files/fenifolexewulovevatuwopun.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/nibagakome.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/lawewowego.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078990a266d5---1641391060.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/17249006440.pdfIn PDF document text
    • http://195exim.com/datas/files/lesozox.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/t5slr913933vqridvboscrkm30/37226783007.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5919798dc---92833695198.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/fawakumatu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dabf033e8---renoxavowar.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f95dc998fd51b831a5ce7ff3a8e5b45e/35275085786.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/27180217006.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6emmn7krhe12rbve9pmlo25rqe/13119764032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=verbos+regulares+en+espa%C3%B1ol+ejercicios+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_off0000bbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF9 11244 bytes
SHA-256: 33b592f5eb4e784fd0b83fe33d2d2fd90d56f6a5dbe9821c502b8015351c38e7
font_01_sfnt_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 18612 bytes
SHA-256: c4cbaca92207a08dcf57ed865fcb00689013089537b6187631213ce0906810b4
font_02_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1