Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5c5f58b44c66fd…

MALICIOUS

PDF

96.5 KB Created: 2021-08-07 11:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2a535e54c4c6a4b3e64fa0de069bd56 SHA-1: d79a9a963ac1f04e91f1ba7284fbdc2ff3929ba1 SHA-256: 0a5c5f58b44c66fdabb6fe8e7dd641ea1c9e1ff4312588c4deacf5c4aca8754e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely intended to lure users to malicious sites. The presence of multiple external URIs and the overall structure suggest a phishing or malware distribution attempt.

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://archism.ru/uplcv?utm_term=othello+plot+summary+pdf PDF link annotation
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a6bd29e14---42589472636.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/757926a55eee6425611e640c28c7e8f5/naxevebanutikutako.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/100d5a96b4bc365ea7a4d1708e7e55b0/xetunobakonopodudoxulemi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606c960545002---makanonofuten.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/timumove.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/dabodinawosepiladorid.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/86223324158.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0f0ab19cac9b78b74a80e129ec652085/netigotaratinezikex.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/wizejosajib.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08dac7c300---13463210449.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/fokirojaretav.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850cb63931a---87219295191.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa65530bc8b---kovejapemaremisokudiw.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/nezojusajizoxofopuvadunix.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202107300232433390.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/pvamap40fk0ctellf9u3ojrf5s/77068298706.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/bupotepunepogowoga.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/27hfggn9a8jl3tk0a3p9v0np1u/65665730075.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/baduropam.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9625ed49a---46426116510.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/febupuz.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0372611d9db75b10aeffc370c264530c/nupunibowakoxivilud.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c79558d31b9---dojod.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5B 16964 bytes
SHA-256: 7216024509f236ecfd74f18f9d2acffd3d4781ec0e390b1a79974a67e2fc5954
font_02_sfnt_off00015bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAC 10804 bytes
SHA-256: 860d93f5e219680f3ddcdc979c8893a48bdfec58b4e6e94d706e78dc37326a3d

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