Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc90f66bc516f6d9…

MALICIOUS

PDF

174.9 KB Created: 2021-07-04 12:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25a70682e4b7e0dbd699e440b4d1437a SHA-1: 7b00b418deb3f6c24cfaafb5c6e70be5e5240aaf SHA-256: bc90f66bc516f6d92b6fe6fd0d6078c7800bded46ee3e9153ad566bf7ae0110e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous distinct hosts, many of which are hosted on disposable or compromised infrastructure, suggesting an attempt to obscure the final destination or leverage compromised sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9644

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alate.org/admin/fckeditor/editorfile/lipopinu.pdf In PDF document text
    • http://garageanything.com/js/upload/files/78245344907.pdfIn PDF document text
    • http://huiking.cn/uploads/file/070241113990.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/suzor.pdfIn PDF document text
    • http://mobilenmr.com/files/files/79769119742.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84c06e4ed---79421782543.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cde67182e39---12295495063.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d1c6b8621937cbcdf58056626917def2/42844166301.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/desorepunowuvepaxexo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/r6me2mertj2v56pq91fe6sknq1/94712890621.pdfIn PDF document text
    • http://benly-carson.com/product/files/22908399294.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/52760021672.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/99901370944.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ec331bd36---fuvatotifenemu.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609411a5cde4f---wefotudozajimatetonovomo.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/pusopesipawonidopojafa.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2149fbff---82739502655.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/kqau1sifb6oufv2sgj98bs5nj0/sopimujobuni.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cb09cedd864e4a313ac6c2a1390bc75c/63412783372.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea94ba9136---jidozejalidanutazobojezur.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/47c4f2936aecff127aedbec4d08c5e4a/79785130270.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/41345678236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+initial+answerPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/14330566033.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/xajorisixovorasa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 16988 bytes
SHA-256: 9f2c114c0bf5680df165a83dfdb3bf0ec533291a152c33c7bb2cd1948abf99c7
font_01_sfnt_off000139e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F0 132488 bytes
SHA-256: c3aadf536bd83307329d9846bf283c56586306ca834764b86146883e843e9fd6
font_03_sfnt_off0002954b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2954B 10164 bytes
SHA-256: 5893c3b308971359bea2a4f065a19a8eb8292b7bd8b9957023396210dfba6d4c

Open this report in the interactive analyzer, or submit your own file for analysis.