Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d83b1aa72d4c63…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 13:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2fc39397cf2ea4447f56588ca95562ed SHA-1: f71aa6b23e77575b499997f776d5c7cf4cc2dd47 SHA-256: e6d83b1aa72d4c6332c8c308d74495e1830bdaaaaf4b4e3d5b02fbef94f7efcd
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://crewmak.ru/uplcv?utm_term=net+framework+3.5+windows+8.1 PDF link annotation
    • https://jordan.si/dokumenti/file/93380820789.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/ropugoropitexigurojiwom.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/43153452710.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/wasaf.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/45882372267.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/49674618911.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/31478532953.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9ab686dee---sifugotutadopowugeb.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/jijixogovobewikoji.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eed6c3d99---3177511892.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/jagozirowuvawetasazolumog.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/14691284537.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/6154131821.pdfIn PDF document text
    • http://riviera.az/userfiles/file/15161824166.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/nawagotobojudepafupuvik.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0b85b060f---57924804056.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/21501991897.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/fefutiba.pdfIn PDF document text
    • https://digireg.es/upload/buwiwajenikuva.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/sawikugonuritomig.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/9791018094.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/63701729492.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/jefoxoni.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 11256 bytes
SHA-256: 83c2cd08bfdc7cb81a7703c6601b8524de8cfb2b5e9f31921b9a0e759332ae47
font_02_sfnt_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 20740 bytes
SHA-256: d5423460eeea35a83af9b890f8444fe4cd3d26abd6301d847be2627ef6645213

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