Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6be215e25b505d…

MALICIOUS

PDF

73.9 KB Created: 2021-09-05 23:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00e82fce082ec084e01a06bf6b506b23 SHA-1: 1a47aa81368de055a9c0c43baababb1b414b4e70 SHA-256: bd6be215e25b505de77bde9784a64185296e98e702f107a143b20433842b3df2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of a link farm hosted on disposable domains. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://capitaloffice.pl/fotki/file/49739703711.pdf In PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2e83d20fd---sozijosuxetubameb.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160af785474313---62230514667.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/54961470151.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/28141919502.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/zoxivinetizigexizoxakun.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/51903682118.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/48681916280.pdfIn PDF document text
    • http://strahyi.ru/images/file/fizojetosanepusoxiwo.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/21287754266.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c969cdc4b---85888694635.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/92979490162.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84f3e3357e---benulebobokajame.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/jaxatif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22deba6a16---55291026824.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/32376093500.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/42817248749.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/40514078502.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/gipurenujuralileropob.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/bozenobolasizido.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/dujutazufunekuzawibevikip.pdfIn PDF document text
    • http://uteambio.com/upload/files/duwudabeveguvasixid.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b80983d59da2a9900bf2e9fe94613324/faxepaxizapob.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/negumudikalimuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=letter+formation+worksheets+ukPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC004 16012 bytes
SHA-256: 9c409bc17f79d8ada693f8940d623a6cfd798bf9f0554f6f1efb8c0233c80383
font_01_sfnt_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 10668 bytes
SHA-256: 34d187377fddc82e47f7d882addea805740da20ae3f104dceffa3f51d98483b4
font_02_sfnt_off00010177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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