Malicious PDF — malware analysis report

Static analysis result for SHA-256 484d1f2798dc18eb…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 22:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a75aaf5efa7c69b1142f7b798da61ff SHA-1: 5830619f8e1f756ab136e44c8a89e057ed744f8c SHA-256: 484d1f2798dc18eb16bad8bdce58283a1bb41164db9e7f494e304000fd6d41b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms, suggesting an attempt to distribute malicious content or manipulate search engine results. The document body is unreadable, but the heuristics and URLs strongly indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=can+snapchat+detect+az+screen+recorder PDF link annotation
    • http://www.cpiequipos.com/assets/images/user_files/files/bawilevomaxazifefobilozun.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/52015159675.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/felitelibizopuxisikudoli.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/17016459923.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/8a639b432a71a53ab75cf6a5ae732d27/vibusapirabiwok.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/98547278905.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3272ccf4efa1ece772c52e48e0dbbe38/7752563431.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/99589474230.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/xupaj.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/wetuwevegizekitabaw.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/lomipuxanafinelevaxabon.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/mlj1fp1jbrffldijc6ks5o1biv/11636380094.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/zalizinunosugurudimut.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/95794553161.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0518b2b9---94631506504.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143a5cf604f5---ledifiboz.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/49988463928.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/saruzepokepo.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/kegiferilesivi.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/69567086333.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/vitomixiranopewa.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/fulita.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_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 17988 bytes
SHA-256: 07093a6dd635bd2b80e2e7e2101faf77dd184ac5f73aaaf27295a7d9cc9e8999
font_02_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 10564 bytes
SHA-256: cac5f4035a6866b7b8aeea68508de62ae7d63b44c542c8db93040efc9712e873