Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bdf216da3d985d…

MALICIOUS

PDF

86.8 KB Created: 2021-08-03 12:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bafbc118da7a87d9316b29a4a2c71d9 SHA-1: 9ae9907830196eb9f95d4b964b3b96be5bd54915 SHA-256: 74bdf216da3d985dcbd8b805648a1e8e38f87aafcf49698dd71c01f0fbe6f087
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests the document is designed to lure users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=how+to+add+capes+to+minecraft+pe+skins PDF link annotation
    • http://chinoboxingclub.com/clients/36032/File/92232957238.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/31187158178.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/26bb0dbdb3ad58216763429337a5c6bd/30907386140.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/51665493546.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/fuvilatofaxoxowadepejuju.pdfIn PDF document text
    • http://coffee33.ru/archive/file/lefupapudobutawamo.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/64633778730.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c805c0ca6a---12122108695.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7mhgnkt16se271epkqnp968a16/4522851617.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb29aabfe5---boxegagakuribukigefaxe.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e88d89745b370a2559b39bcc6aa75063/kavajefesuxamijatit.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c1a851c02---134035650.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/5999353793.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/480389e18490700ce24d1aaec7275fbf/xawifumokefenizisix.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/43468884825.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/xuxotorubu.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/risixakit.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e992be98---61779853591.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/40900653310.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a7063007c8dd83fff3a282858bedaf17/77442892164.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/12895963705.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/lotewamamujo.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/12766802347.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e62a1da77f---nalenidas.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/mudadizojidupom.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_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 10904 bytes
SHA-256: 7661da52f01b49b110afc994dc6519a8c3cb43e57e9c5a964b62f5316522663e
font_01_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 16856 bytes
SHA-256: 60cd1954d05a231ddefa42c83366a1cce4bf529b2544c1d71dd470cd97c3bb94
font_02_sfnt_off000134c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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