Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dfaf80443d0a9f…

MALICIOUS

PDF

88.2 KB Created: 2021-06-29 10:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 071e1f0feb0bdcf19290f96e5137114d SHA-1: 0fdd071a8bcc507286894b0366b30d6bf3fae58c SHA-256: 21dfaf80443d0a9f22044b525765ac1c4d00fc49e77a4f2370dff585a96b7982
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mygo.com/ckfinder/userfiles/files/83190108798.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da3e13499db---xigelogojunali.pdf
    • http://ranaghatpchsschool.org/userfiles/file/19418085888.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa4475f90c---52770529809.pdf
    • https://maydangson.com/vietkiendo/upload/file/vitobepaxixixaguni.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/velukexotuda.pdf
    • http://dokumsuzgec.com/userfiles/files/suxulidekanawonemutamufe.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0e45df66---zuduwelononunena.pdf
    • http://vector-luczak.pl/new/fck_user_files/file/25000496780.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/r0jo9r6ki0hq2qt4bri9hm89nr/11845175766.pdf
    • http://minicabii.com/survey/userfiles/files/51006844920.pdf
    • http://jucal.es/images/file/88955730565.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5cbe68c35---73009189275.pdf
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/3ec3b52d404bfe5191a72d8e4bd1fa5a/50347785547.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa45767a90e---kibizovixikalir.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b33d72ca8---kovixevilinizoxukufowe.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/vlrh6s3fs2g3jk7lq1nc3qjm61/76640915371.pdf
    • https://angkorphotographyguide.com/userfiles/file/xovomotatepobexidatifezis.pdf
    • http://altaprecision.com/userfiles/file/gewuxoriguwolavekos.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22921e52d3---48631568703.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098909c55765---firiturubibidov.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/fkr9f199eu9oo7783v23erlpp0/42037674801.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/mkfisnaiqtpaspbsqgof5i8in4/70220971085.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=peanut+butter+with+lowest+aflatoxin
    • 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_off0000ef13.bin
f0b99053b17b4123f6bfa1fe357a5e9b0eb2799fa7683fd81586daf53b53ca6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 10740 bytes
font_01_sfnt_off000107c0.bin
7d9c8f5f2a6a3a2dde6e0115c603571b988c1dd1b285c3c5102db261707b0a3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 19588 bytes
font_02_sfnt_off000139bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139BF 16792 bytes