Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72dcfece02a8eb9…

MALICIOUS

PDF

89.2 KB Created: 2021-06-29 00:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b4809a75b76644a7bc6d71afa797d758 SHA-1: b956f50743d03da4ac0e9f76e5f09477032331e0 SHA-256: a72dcfece02a8eb99a7a8263196f985d994abed3c1f7e50af06bc13fd3fccbbe
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple compromised CMS upload links suggests an attempt to host malicious content on legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://oniceh.ru/uplcv?utm_term=find+the+missing+angle+measurement+using+the+angle+addition+postulate PDF link annotation
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bcf94db604a70f1b66620708e0af43be/jated.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc59485d84d---38696387039.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/28647388424.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/2347tn2o6q76smgv55f2n8b6io/pijozabosa.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c82d8795---zezibuwipidemutobinopefo.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/pusavupe.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e720318c---78145393223.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d7e6c0a4---84954758903.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/17122866449.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/ridadavofijumakiso.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7f64c88d0d8fb5b3c94827d81f54dcff/nafuveb.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/zevapujeposoresawelubolev.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d18da5dc1---detawifikutesa.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/0v7b2cpvps6rcepeuierjfch30/79695528551.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/7efduc8kj6hck7lnrq7dktnj35/18808544920.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1834ef686---60600242961.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/9469458351.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/7844740423.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d79db9efb35---92062799034.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ecf51b9266ce2603aecdd8850440aef7/164255580.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/luregeregepegidazep.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_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 17428 bytes
SHA-256: e8fbf82179c3ff0d1a9573e3c5755d470d7dc4c15c57fcc2959ab055cf95283f
font_02_sfnt_off00013c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C11 10916 bytes
SHA-256: c4aecc090f2d6737f524c1ecdf1868c443a611103ca169b14bea072933875c3b

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