Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6dfe0e559524fb7…

MALICIOUS

PDF

77.5 KB Created: 2021-07-15 21:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 245d6fab08b7630146f9513804487aa8 SHA-1: 6dc5752d681e3967d92263935bf2a844ce1c5430 SHA-256: d6dfe0e559524fb7b220212cd55210a489f457b0387e7cd281b337a984dee7af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b75873439b544b97c3872ba5dd4d3047/nofux.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a681cad2ad0---latofapatelusisagixep.pdf
    • http://mikailang.net/userfiles/file/20210505191943_1122252670.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f51f3e24---nomidunatetaxisijowowusew.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/6f37d9c7aed1bebd1988222c7e413615/6932640363.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45772a1e1---kanigerupokor.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7531e7cdb7922150c2d7f14ead4d1711/sadojomemononibiva.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160837e31af5d9---detagubivetelulimajebe.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/8noen7lc20ri790nsusnp03d2m/repoponujatew.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/v0hgcapd317a9sevu1hcvktuad/nizijivodivex.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae343940d0f---68546802852.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe289ffa3---81395537774.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6b0dd1b1c07ec8c5eac67cc2896bb2f3/zaxumirumutedemobo.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607392a6eda84---51412520086.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ukmkvkmhrp3jp9me6dlnl1mbgv/19412031865.pdf
    • http://jatechkj.pl/upload/fck/file/merufogazurowef.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87f219ca5c---resakemibinolegepatibofet.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d716c2c317---podipibo.pdf
    • http://fine-cottage.ru/userfiles/files/wamosopurewosusopopig.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3af0e27b---durusetap.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a0bd871c---pijimixegitelazinawajuni.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/d2b391ddadc046109c96674377badfdd/xewofeno.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/bopipisugenemozirakeruw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=drawing+happy+new+year
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce3a.bin
4aa8352cca8cbe8ca82be746a6c20d8f72bc52a61720fa64984e95c9e410537c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3A 16676 bytes
font_01_sfnt_off0000f9a8.bin
4cfac8861f7a3c37a3b10322ece30c07d1762a003d1361d1842028c1a8764624		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 10300 bytes
font_02_sfnt_off000110d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110D3 16792 bytes

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