Malicious PDF — malware analysis report

Static analysis result for SHA-256 082f2b720c168a1c…

MALICIOUS

PDF

85.2 KB Created: 2021-07-22 00:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 57f03e1e1037f662a960e1564effd187 SHA-1: 55f81906d924a16f39720734cee7be167ba5a572 SHA-256: 082f2b720c168a1cc7fa6a80c0b0b83fc012bbd57262636cfa25da9de955c22f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged as malicious by ClamAV. 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 suspicious score 0.3358

Heuristics 6

  • 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.
  • 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://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c082bdd2909---40213572642.pdf In PDF document text
    • https://alteanetworks.fr/img/file/28877119276.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4a594a9a674865c3bb50cca6d045c7c9/doxadobajuzepefegebe.pdfIn PDF document text
    • https://signika.pl/Upload/file/daladuvibapageren.pdfIn PDF document text
    • https://artbynela.com/uploads/file/sasibexug.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/80477028473.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/xebodutamediduwisurowen.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160972caaa57e6---22540764161.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded6403c667---47644083173.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608366a62239d---jilas.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/semubobowuzinebebegit.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/12836419638.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/dapetaroniz.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/15734386856.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910a78db7c1---kepoxamezusuriwawam.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a38cb7cbb---22241792989.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9136bd62f05a4797774289b1ae8a00e3/70005601247.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/804d7740a77d3b51e5d543e67afa55e0/jazel.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/23d330033cee25a86313ff49d47ccee1/51386067069.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/jaxaluregetanagaretoso.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/73qe56j7tld8n64eg5e8oje3go/mixilubufefuwilebi.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051504495473499.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f825fd2d63---81510562491.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/77721570830.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a92cafc7180c6f9809d8e7f2ee2a1ab2/rilapibidodibibakowop.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/dexovimugebobakitumono.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3965785e9---difab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sample+letter+with+conformePDF link annotation
    • 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_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 10736 bytes
SHA-256: 509d1b87bcdc85710e1ffbd12b35355f581f29a35a939c94daeb5dd163911420
font_02_sfnt_off000122e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 16948 bytes
SHA-256: e9427fe28332d9d40ab26c7ee5bea28867604879e531d262d0fa54538e02f526

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