Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2b123c58261215…

MALICIOUS

PDF

96.0 KB Created: 2021-09-07 16:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7743db1485cfca7756cfaac0ac1a669f SHA-1: 9c888914ce3c200b9ccb8a1673cd356526b701a1 SHA-256: 0a2b123c58261215068ba1931ece601d883ee51da87166202f26247f40388c4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing pages. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=nilfisk+gm80+manual PDF link annotation
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/08479ce0455e22e7bca142a7ae3d50a8/64462479495.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070828fc4448---kizapisufotome.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/38602143574.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7f93b2dd3fe47771b2f20e86eda05301/27264428931.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/regisuzudaxakozo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160865c59f1377---16775500316.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/manidotegufe.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/00035aa7fb63d03d42744c9dda9cbc8c/91573843893.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/72672713318.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/tobelepeti.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826b243f277---diwulezagigivakifesunaki.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/mererufu.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/nureri.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/38a2178c6646a494e6a58e7b72f1a9f8/77477222116.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef6048c2f---88310479750.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160930607980e3---76127019002.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/leguzolokutoladafe.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/7557107183.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a517de76c26---65262388509.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/77997558201.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/31515300242.pdfIn PDF document text
    • http://hanauhrova.cz/files/zexiputobila.pdfIn PDF document text
    • http://konberdbio.com/upload/files/68055715136.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001265d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 19780 bytes
SHA-256: 1c473b34481a537c701ef6b97efcc805d1cd15731d3dc95cd2b30f34c7eb33eb
font_02_sfnt_off00015a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A61 10604 bytes
SHA-256: 197288e36f3dbde8ed8a100c5a62ebb2490354642307942c746cadea7acb2fba

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