Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f34eff17bd3a29c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 23:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f06c2f3afba0f8b5331ccfc0acc1f456 SHA-1: 7f2acf38e92fab9d8af0b85390554dc873d1fe58 SHA-256: 5f34eff17bd3a29c58e80ad8ebf2dc530d7c82d96a73a1fd51fc1a56c7328210
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=online+live+cricket+tv+app PDF link annotation
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161354897220f7---82514366465.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/xuwiruwuxebimibelaboje.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc00c8dea9---jukatewejaxuko.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zijumovatatapezero.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/saginowufiparekobo.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/wenepafige.pdfIn PDF document text
    • http://archbot.pl/files/file/69825324187.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/21f528868d24b638ab7ee1b6a19305ea/jonopegazazivireve.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/1136126461.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bd8e4d6bd---5270966960.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/17806664532.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/sikoxigaxotimizu.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/kojojejefivunejolo.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/dipumutefeduwigewivi.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/xevemazokenix.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/melaxatirikug.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/navibed.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161337b3cc7836---mulizi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335235de46d---49897918161.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/40697921527.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/91301935335.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/26980049457.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/77056242890.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/85713128353.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/17994367110.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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 10264 bytes
SHA-256: 0ea9fec32635f635b109f2f0765ef16d0acc54d38b15505d68ecd74660e62b1b
font_01_sfnt_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 17496 bytes
SHA-256: b95c81549d8a4c8e2c2b1fd1a3525d0496287505293ce97c7ec9813e65b2640b
font_02_sfnt_off00011c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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