Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1bdd0b74937e69…

MALICIOUS

PDF

79.3 KB Created: 2021-07-13 20:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5cb5f5084ce0ef20881de5aa0a53064f SHA-1: bd76a9f24282186e7ff3f747d4dc15eebebadec4 SHA-256: 3d1bdd0b74937e6948f45c4ff48552adadd3ccfbfdd5dfb8ac820c4067960eb8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates these links are likely part of a link farm designed to distribute malicious files. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for further exploitation. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 7

  • 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.
  • 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 http://conservativista.com/js/ckfinder/userfiles/files/nijasoxisu.pdf In PDF document text
    • http://myconnect-thailand.com/image/upload/File/pororuribofasere.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/914c3d1d108c967bac203497cc2c4b5b/lijazefaguwigexavusosunot.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/921eb5edb03ae5fdae4b0599331ed822/rideter.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54a63e2d0a---30916507350.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a774305329c---79821399571.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097a423587ea---66974139653.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5bdb9ea9---fisiragofutowisomogeteze.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/21076669863.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/toxutumamupilaz.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce51f77208---wanadegelikuvow.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/rezagiputadanimutagirav.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0217556001623568048.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/66da589fa3e6ee3f2e33ac6f98af9438/bojubakorobajinagorekud.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/36029351640.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/34805606186.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/65056705536.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210604191443.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e23b2fead---dajotazilurikuwow.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/58823060204.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088426da2b75---49582410454.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeebe2fd01---xaxenilolaferotexonulaw.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/zoloko.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e098a417---41663582770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+museum+of+illusionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 10180 bytes
SHA-256: 8bb00bf1a12d85e8f8dc5a73e8089340cf7db641d80e45d9d64ec6570e94cf8a
font_02_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 18308 bytes
SHA-256: 35bd0e942a4d7215201ebec7d90e5783d48565b52f0c2e70f5935f713e584546
font_03_sfnt_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 2580 bytes
SHA-256: f3476cf4c154939d4f8584e4bd5d7af68bd64c5649b31e799fa0da1cc1d6ce68

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