Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52901f1e900ab40…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 15:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e4d305a2652b4e815578742b29270513 SHA-1: 3839bbd25e7ae2cd763fe994b03bc2c475787d40 SHA-256: b52901f1e900ab40555427a96bdce03931d55c105dc960a0009b1033a6bcb556
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=code+rousseau+moto+pdf PDF link annotation
    • http://ourgans.org/userfiles/files/jejitavezudafopexaxelires.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2f66eadb65f0df80c6e97cba4ee10dfc/24709196449.pdfIn PDF document text
    • http://ktcz.eu/files/files/38703964577.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16128d129e88e8---88595624739.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/fapumeximigedemofig.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/komuwosipivez.pdfIn PDF document text
    • http://deltools.com/userfiles/file/16859679223.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/selax.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083300103aed---lawira.pdfIn PDF document text
    • https://stvorki.ru/files/file/polekisag.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/mifodademukogewerurepo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aac38a151b7---46885267538.pdfIn PDF document text
    • http://altinellerinsaat.net/UserFiles/file/tobobumusamenipopi.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/12390669566.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/degerosuxubulemavuluvu.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/40263355871.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/pupefatem.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/22092263693.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327da4e6043---tumisorizevimiravusim.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/gopajugefolemusiv.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/2717190855.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/sepamutinekonifej.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c512769696---nasesumak.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_off0000d8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 10548 bytes
SHA-256: e41a3b3e2a542412d1ccf8c029ee28363006b507b3642bd5d40c56850878526e
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 18692 bytes
SHA-256: ba9054b79f4bbdc081b7ef05c7ef53bf359a6016d6ec261dfffce4d3f611ecca
font_02_sfnt_off00012162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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