Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39792d98b7934c0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 05:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6125e1e111e5b2b2ae4435fa2b9def71 SHA-1: 282c2d4cb425ecba6c0f4bf7a21892a228fe351c SHA-256: b39792d98b7934c0a30c39be3ec5ae1ae7dee972afdbe042bc4dab9f64a3adfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on disposable hosting, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://philabc.ru/uplcv?utm_term=free+totok+video+call PDF link annotation
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613175b2de9e6---79914543171.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/25161970749.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/ruvudasatikedodozil.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109122245039826.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/56295553364.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/85638466503.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a096df85a---tikufapupe.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/72809607209.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161369e9b60385---6125914638.pdfIn PDF document text
    • https://kimcert.com/E/file/nexepu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/7qjkp4uu5fsvncfp0301nln3g8/pufomorasewevodavax.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ge0fk1f8p7hgg9kgli49ab0bar/runogapixotetaferiwa.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/sifukovowosuvagigor.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/nuzuze.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/redinemu.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/42810435340.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/84011209364.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/gabagukugoraxatuwesemo.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/58818504486.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/nomalatukawowadororojax.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/kigobilupe.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/ladivoxakadodoxisuve.pdfIn PDF document text
    • http://sooclose.eu/upload/File/17745257519.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/gexenobekuzaf.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/memenevikukixivevisupin.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/78163483807.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_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 17136 bytes
SHA-256: d51877b921adbab73f7fa0dd08a36aa6f0700d170e909c879e720f3168891cf7
font_01_sfnt_off000110c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 10228 bytes
SHA-256: 9a44044a1723c896c82438dd44990020fe3113f96114d5335fa10e9e0869f69d
font_02_sfnt_off000127da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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