Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1246e88374374d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 15:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fbaf791b7984b98eba80fc90db4040de SHA-1: aecf0612a876ccc0389890f34d2fdf8f1932981e SHA-256: 0a1246e88374374d68ae4659709f70e56c5cf9aac9e05e5c68f97475b80c001a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of common malicious PDF tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cructi.ru/uplcv?utm_term=aplicaciones+piratas+para+android PDF link annotation
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/zemapububetujifetapejid.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/08e28f5db3bd33ef02a6de41fca521ab/pisodararirosibo.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/61541827326.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/vegoravurubejove.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/54128687181.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/belebujizigojebopipuzor.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/63639352356.pdfIn PDF document text
    • https://anup.bo/images/files/jobugim.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/vanemizaxuk.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5076e9a7---pofolebiximitopawazafaju.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/jibiwif.pdfIn PDF document text
    • http://rideco.hu/upload/file/33140396345.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/bakuwugetalamuvufiba.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/89376600737.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/15296115508.pdfIn PDF document text
    • https://vendax.ro/files/file/96560062911.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/bixijaketogev.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/42060880356.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/62017583117.pdfIn PDF document text
    • http://strandedtattoo.com/file/77222637887.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gfmnnl20mnmt2i6mn0bhvj2b52/pabokureto.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210908_A5D7C5189225DB2E.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/94155355279.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/ragikepiludi.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/limofon.pdfIn PDF document text
    • https://ip-pharma.net/data/files/walesu.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_off0000db3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 17776 bytes
SHA-256: b976abafeee066cf93adcad4e6c245897a61f769a6a65f11910d4f8f06ad1128
font_02_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 10488 bytes
SHA-256: a256b2984e02ebfeb142a714894544b4af8dd0511f6945b92465214ade101e28

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