Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dba12653162b80f…

MALICIOUS

PDF

108.9 KB Created: 2021-07-08 17:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0127d8431def06e32de264635dcb49f8 SHA-1: 4174d1f958363ecbd7d1c56b7222c5b23d51d84a SHA-256: 5dba12653162b80ffb2bd58129d53ab4f380bd658d317e56ea7a55f7edd0932a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised WordPress uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure are indicative of a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=obsessed+in+tagalog+meaning PDF link annotation
    • http://trunglam.vn/uploads/userfiles/file/sogoguxuluxa.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/85200035017.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/38165534715.pdfIn PDF document text
    • https://area5srl.it/file/julal.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/l4b8dmjieaspsfbce5ucv465pa/84196589551.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/2763374566.pdfIn PDF document text
    • http://hotelsandmartin.cz/files/file/7515625454.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e1d0dd4b409ccd53405f38fee491502b/wutuziwijonenifaxetoru.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ctif0k60c798veh47i5tub3fh3/81597661831.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/lelevujenomimufoke.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21bceb43a---mutafofurobunefewage.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/gotasaxomawemekumoxodo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9211e367d---nibomuniwamopag.pdfIn PDF document text
    • https://songhong.info/userfiles/file/mimugivuwajifij.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/a87f864d0b85bd1d58b8ebfc93f29614/27704100221.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/r6evcm18qe680auap8o3qfh0jl/22492377861.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/8f1be867fe61119fd3964796438861a9/mitarikurawenuzijaro.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/27218355167.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ef6623e3---67211784472.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b14aaca2d7---pebek.pdfIn PDF document text
    • https://avenue102.com/uploads/file/nezifenolow.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/tivupobibule.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_off0001466b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466B 18228 bytes
SHA-256: 3ed5d4db534f3408538b7e2deccae4a0e91aa1ad4041c2a77dfd2748a2ab3edc
font_01_sfnt_off000176d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D1 10656 bytes
SHA-256: 41657e29eab5c9e00158deb626909213037a18e3223f7bc46e32a6bb216fb0e8
font_02_sfnt_off00018f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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