Malicious PDF — malware analysis report

Static analysis result for SHA-256 731bd734b6cd8866…

MALICIOUS

PDF

82.5 KB Created: 2021-07-13 17:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d2a2dfc53f995edcbf5681efe4ff4722 SHA-1: 12220d061e18b4d9d27b574dd8c9825ee3e1f659 SHA-256: 731bd734b6cd8866fb04776d6ee7a64114133e306128fbf32f24db88da938fc1
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, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/6tejnbihdung3jducce2d0jbq7/futegebididage.pdf In PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac04448faf---24700305646.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/tetuzemekaxoneroloz.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/72246770082.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/h9om05ra5rk7ddtaab5bgqm714/48367985896.pdfIn PDF document text
    • http://biosite.ru/images/news/file/3317100971.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b46b63c7e19---devug.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/vozijuxogefoxiv.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/44732efc2f82c44b63a103d4d18d18ae/68831223610.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/5260n5t8jg1kao1kughgd8hse5/63410137234.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/dd601f02cd03e81b565cd3135a6d6473/valefunamujoda.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/24981536887.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/86482630451.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/5c2g5l7gqi8h0kgst8lg8gc4n8/sumeziba.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/a3746cfd14f1214685b7f643bb3bccb9/logimitezukofopapatudajif.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/28774877278.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/xesumevanivanibov.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/62009206206.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/98ddbd70da1c6ca0cdab20ae85a6811d/97533026499.pdfIn PDF document text
    • http://nensi.si/upload/file/melisakefunigekubiwamud.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1926e2c96---sirun.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/174imcpqldrgha2hi80a0js7d5/43868314449.pdfIn PDF document text
    • http://halmar.info/userfiles/file/wipuraditujominopuposi.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/megusumis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=red+candle+and+green+candlePDF 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

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_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 16100 bytes
SHA-256: 3cf0bc1a66a318f5a8b24bdaa4c5855570697883e99547bd2bb95140f44de158
font_02_sfnt_off00012625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12625 10112 bytes
SHA-256: c38eb347fc8849cae05e4b3d873e0dffc865f533e24597542bb3c9c14bfbb0ad

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