Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dea64554a5fee9…

MALICIOUS

PDF

88.6 KB Created: 2021-09-07 21:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71c192eff301a7fdc66ec3d1213cbba6 SHA-1: 9c0c35e5239a262c3e9e68b7ce39f3dc377d301f SHA-256: 39dea64554a5fee9cb9bdd741d7a764654d235bf5d7d9f695b51cf85e09d0e87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://614move.com/clients/4890/File/47373651270.pdf In PDF document text
    • https://gregor-biffiger.ch/userfiles/file/xikopabalomuzigaxasuwor.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/622db7bc0cac0bf82169a325647589de/85345788489.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/44f805dae391924b5566e59ff167023b/44614041117.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b4ae6c1ca---lugafosim.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/3893053576.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/mupekevoganapugo.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/woxolefuzofejagezedisava.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/nhnco70lbtc0l3g8tqmetmpfh0/43998436207.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/76422470819.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/ranazufazusibuvotunod.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/46204563392.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/guzobinumixikodufojig.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/8301939906.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vrgct9qqadfutf3gqlltva6ami/55005454457.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/97066775882.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/4mplejv9eqq732g5h31b3g1533/23395108330.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/11043992297.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/77082094917.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/b17pg8lu5nkd1520erhrtau013/12500419142.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/76f41748a555df0c68cf5a0217f5bb9a/81938544969.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/12363709816.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/resofulotivifu.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/ce28b6975bc009018fe032e94dd53e0e/34873085620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=photosynthesis+quiz+answers+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 19568 bytes
SHA-256: 41b31f38c776ec6f420de7f186a0cac76e355aebfbb04c6452cc4e4454b2405e
font_01_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12491 11056 bytes
SHA-256: 5a1f39febfef69438b310507b2c7e972194a4a2f05b88e3bf54bed2ced326601
font_03_sfnt_off00013e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E33 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1

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