Malicious PDF — malware analysis report

Static analysis result for SHA-256 023e02416c85b6c7…

MALICIOUS

PDF

96.8 KB Created: 2021-06-30 10:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d8e3d589c37f497efaf742904b8f75e SHA-1: 97a37e597cd3a4f23ca115af966d0a1f43606862 SHA-256: 023e02416c85b6c7270990d0351bb9bb2d4dd205cf0fc079254b789eac13786e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://medvor.ru/uplcv?utm_term=normal+heart+rate+for+11+year+old+female
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3684863684cfe9cca54122c1512ec201/tonati.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2d700bc13---9452739628.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/0cc2a7200346bdf6656098f951e97fcb/kafatuwudomob.pdf
    • http://apsara.ru/userfiles/file/87415715825.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7f7d323fbf6d4ce19214d24b6190f426/laluwinurup.pdf
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/netegusenirakitakaxefe.pdf
    • https://iamtimeshare.com/userfiles/file/gajibijosowipiteba.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/742d853c37beea09224175f836df3af4/9585185409.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607630a1c4257---nabituti.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/tfeb3cts9to2pob8p7jhsuoa35/2635396958.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/58e6f2cc02f3e46ad99a2dfacc0da720/vibaxuloguxab.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/8c2339e0b444eab92fe4f749df1ff165/88510796111.pdf
    • http://aklond.com/UploadFilesfile///2021050517200172.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083081cdee0f---52484020046.pdf
    • https://chp-travel.ir/data/file/20648547022.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/07376a41a7ebd34dc58ded451f305b8d/kukisakub.pdf
    • http://auxerretv.com/content/public/file/vufatupozeni.pdf
    • https://nazragame.com/calisma2/files/uploads/sijekubobano.pdf
    • http://talleresjpg.es/img/file/80524384474.pdf
    • https://puppometalli.eu/file/89395271123.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/80892ae45f47154d833ce9272d426ceb/4831530474.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160710dc576622---zisilumutew.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a040722d3cbac59f5448dbe9363a349f/93319972619.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/fc5fbb3d5c514d15f2faa825d311bb14/18257607348.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ab.bin
072d81897e65e5889d2f960f91afd212ade1ad87eebbb970ccfb7cab60c94afe
pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 17452 bytes
font_01_sfnt_off00012fa0.bin
bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 16232 bytes
font_02_sfnt_off00014583.bin
1ed923978a317b0c77ace989e5b3295c96ab30cbcb416eb47621f070c056bb6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14583 10396 bytes
font_03_sfnt_off00015d1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1E 16792 bytes