Malicious PDF — malware analysis report

Static analysis result for SHA-256 6beab10ee3c77a52…

MALICIOUS

PDF

88.9 KB Created: 2021-08-04 19:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 36e21be1799c8bb7aad79211adeed1a0 SHA-1: 032a40ee4f0d15ed7c49ec08488dbd5b61a04af1 SHA-256: 6beab10ee3c77a523f1fa0bfa6aa953d5e008d18fd9374bade20c05d363258df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or phishing pages. The presence of numerous distinct hosts and URLs indicates a broad distribution effort, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/52qrrgib4ll1i6r6ukli717k3t/xuduvodad.pdf In PDF document text
    • http://backupcenters.com/userfiles/file/90385534515.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160838f168942e---71698745202.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/pckfa0aptjrskh6egs07hnd8h7/86277933785.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/17002506124.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/2100097531.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc286f3a88---58212232847.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/39158007622.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/93122563521.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/mejotamujoxefar.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16079dae5a8258---mokepojekulukijag.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/vopodeji.pdfIn PDF document text
    • http://dolnoslaskialarmsmogowy.pl/imgturysta/files/labafosuxutosisetu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/igqptfiq4so82ei8c872vt5ljb/didobex.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/zapetudagakabopimukaxevod.pdfIn PDF document text
    • http://www.asslar.de/downloads/61651388084.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/ba4c861552bd729893ae5077f29edc24/9865813286.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/96491408174.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bd0e56fce09b257961fce26965e9c234/dexasotidebolijeti.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c349e90eb10---vamutuzereg.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gr1druhj44mggsa75kl111kg81/78603837930.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d71aee46343---ravapulosiven.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c5e1e47c6ffbff56e9512d079ec73fd8/vobebapatafojaxalawu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a77217fa20913d50d630877540d3e63e/60444600827.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2ac9e834d---xikuseguruta.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/97ff7457efc11a930acff925db6133b2/20030842128.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804babb6e71---59109539639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+write+sick+leave+to+teacherPDF link annotation
    • 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_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 10460 bytes
SHA-256: eb5c7bef482b20fab1cc2c392ea404de8f0213b19e1427e47c3a78ef2e987085
font_01_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 16504 bytes
SHA-256: b8643a706ef1d3fe893a33073914e5446f9b2239b4dc47542818cb522f0bad3e

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