Malicious PDF — malware analysis report

Static analysis result for SHA-256 b064bcdb66e0d3a3…

MALICIOUS

PDF

103.2 KB Created: 2021-06-29 12:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cabca1a038978e7929ea9ecffd250149 SHA-1: e2d681a2339269cc226af63ed658f4ad73ebd89d SHA-256: b064bcdb66e0d3a35baf3045cd609a1db3f8b20e6964c717177b4aff2b0f817b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and other potentially disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://amoy-art.com/Upload/file/9011948942.pdf
    • http://aj-logistics.com/stock/userfiles/file/1422760537.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160763ac953939---nesavusomosefuguvexusiluj.pdf
    • http://czdashan.cn/uploadfile/file/2021051401474773499.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc20dc5ef3---53792391704.pdf
    • https://besi.co/ckfinder/userfiles/files/44851272301.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/850e1a2e9ffa119db1b022c2fd3c36e9/bajazuxivava.pdf
    • http://globalquestconsulting.com/userfiles/files/fojuvavosudilebotililivol.pdf
    • https://llsindia.in/FCKeditor/file/58821061693.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/33203170868.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/bb3ef4c1f27eb79135519c53207c41a7/31737437237.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e39e1c3a0---36738179972.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/p80ef2n2pqogeqrqo8btq3unh5/25766062838.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/xudorikasujilekivofe.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a26779217abf63f8fdf36854cad8583b/2696171540.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ee3050536682b8dc9fb39f0dbe832d28/54788408880.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/2f85b30e68a150d34360d8eabf829b8d/larexepizaziguwow.pdf
    • http://unityproductions.com/upload/files/38536746382.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/c647lh7jkeitmv1vblmes19vd9/bubuzo.pdf
    • http://provia-events.de/pics/fotos/1/file/14107799579.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/d5k3raseda0rac406chgbefar0/sajasig.pdf
    • http://thaisomboonautopart.com/userfiles/files/dozenovofox.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838168bed2c---sedumoxajosovuk.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/9e9011fd67d30ac99e4bb4cd058e03f6/wusugulomadulozo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=find+equation+of+plane+passes+through+point+and+contains+line
    • http://s292376414.onlinehome.fr/datas/imgmail/file/pasafewabinuxovizikozif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013054.bin
79cb810ad279e938d02087f0baaf7c977b97b029945bcb16cba3e45538434167
pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 11124 bytes
font_01_sfnt_off000149aa.bin
44096ec139e13b1d7e97863f87d3488a95c276668ff04d3098b87e447bde9129
pdf-font-stream PDF embedded font (sfnt) at offset 0x149AA 17216 bytes
font_02_sfnt_off000176d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x176D1 16792 bytes