Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a48340130649e0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-09 18:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1043f6bf186e3adeb14acc64fc0d070e SHA-1: c519b907480f392a5fb41d53ce6e10a377e5f3c2 SHA-256: f3a48340130649e007083e21265dba11f9fd2b6432aa9e95330c6eb3bc27aead
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://cructi.ru/uplcv?utm_term=fifa+21+mod+apk+android PDF link annotation
    • http://tmtechvn.com/webroot/img/files/77213942345.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/wobal.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02300538f---didonesidudelaxuwanurag.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f30777802300db38f0ad04a17829a0d4/likufaxefajibad.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/valavivokipevose.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/mirenegebugaxesujax.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/61455545337.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/24987197033.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/14251012726.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/kixepizaruzesaxuro.pdfIn PDF document text
    • http://davcpundri.com/css/file/joxudomomideruseti.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/32399335635.pdfIn PDF document text
    • https://everestart.com/images/stories/file/51607875116.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d4ad77b5f0e1433f304bb17321e576f4/munoja.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/13000124302.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/2991448843.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/31157742645.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/75836545059.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/53655477633.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/48192059752.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/622d375a18c76331cb369a5561853caf/redepe.pdfIn PDF document text
    • http://aa-nusd.jp/wulutagajobajim.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/giwetutogubosutujowiku.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/rafexixezuwerizigepaw.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/mekolibiraganujoxuv.pdfIn PDF document text
    • https://medius.sk/userfiles/file/8471558704.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_off0000cb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB03 10456 bytes
SHA-256: 9e3aaf25eb93caa09db619700c3c3dbc96b371e8e91a10f8182a62f4a89dabd9
font_01_sfnt_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 16848 bytes
SHA-256: 4bee02ed7751bc2288f14b1dd83afcb71ffb01e3903e7fdb4f256e23eb7945f7

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