Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4720e904029d1b5…

MALICIOUS

PDF

84.2 KB Created: 2021-08-16 14:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39545d1248a8f40c8a14e669a21d520f SHA-1: 25176fc7160c31d71d7737e7880f162ed8bb5da8 SHA-256: e4720e904029d1b55dd761b7fe2c641b95395c9250285069fd6c3708aa029c9a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=nonton+film+surga+yang+tak+dirindukan+1+full+movie+2015 PDF link annotation
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c326c956b---49981114750.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/64066260354.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/letexopesaribogilunupax.pdfIn PDF document text
    • https://dineflon.com//files/dakunexapabenetetaruzewev.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/88244143929.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/zurigodiwazemojelatu.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cfe8e458d2ee23aa99ae549a18ef876b/bafej.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/pepolezimutuvosotito.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210430202710105.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161144db9364cd---25578356177.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/2237450324.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/fokugowuvozov.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b69d2b88b8cd5bdeb0fb106a4c9e6e3/vixosinajulipaxegokaluma.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/75335544111.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c897dec4b69---tagigukidubuteg.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/riwoki.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd6721dabe---bavizokasunakazelagow.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/tegiforoxatejowak.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/fobomuk.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1365a96f5ae544104ce37c7511179ad6/xogilipixotetagaso.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160720cdecde61---59489209773.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/pokopobasotado.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/aa4f4fb9b1164a383b7395702556a6f6/50410486157.pdfIn PDF document text
    • https://medtek.vn/storage/file/jolodulorub.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bc4ab1aa5---2774749787.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_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 17432 bytes
SHA-256: b7064d0855d15c8b2f28ab396677bd4f809baedf72279f40ff20ba76391c6fcf
font_01_sfnt_off00010f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 11476 bytes
SHA-256: 4ad509cf8a095c1c6cd23e47d92ce0d397b29e6457457985ea5e42b7c6116c18
font_02_sfnt_off00012a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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