Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80d26e72fdff657…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 15:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9efd5274c9895dbb9715a10aa299bb3 SHA-1: 08120b4114f0842b8938400e62703ece285e8c2e SHA-256: b80d26e72fdff65786087316a19053abe691cb48cd11c6085abdfe885f2162ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://infrive.ru/uplcv?utm_term=much+ado+about+nothing+2011+full+movie PDF link annotation
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f922c6df2f---degotogowogo.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/varozamosusagazo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fccd8846832---xajoregakolupegerilokuveb.pdfIn PDF document text
    • https://yuss.it/file/jovarixoxum.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/27920043877.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/58387738453.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d25e3a117c---zowebekumap.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/95958855203.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0f1ad2e2a64e71067d8fa399e8adfc36/72899473030.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ff86e3c54d1a15a10b95fa379c2982b9/41230704657.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/kalopivuvefunegidegira.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/d4p8rhkda1qtc38c47ljtgur0c/12704553802.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/sevafokiximoduwu.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/lepetegekixoposojuvux.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/76625474886.pdfIn PDF document text
    • https://bursaangka.com/contents//files/gelozelizalisupak.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/een6k97erheb4oagr6vnbnik9m/25376419589.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/gezitabat.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/lovewakisedutexek.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/44973480027.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/16806349119.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/putolofedaxazajedure.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/wutex.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ns4h3n59pk0suj53i9bgmbgmg2/9532145497.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073e06f1843f---sezimixulazises.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/70077777607.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_off0000c6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F5 17676 bytes
SHA-256: 353ea52d37781c0416e2e586ca2b29b2f943d283a193596da07627d72fd455c5
font_01_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 11248 bytes
SHA-256: 89a60422005d45cbb4653c823b37d015bb380cd81b67a4723d868990b716172a

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