Malicious PDF — malware analysis report

Static analysis result for SHA-256 9219813e681eacad…

MALICIOUS

PDF

87.6 KB Created: 2021-07-13 14:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dc39688f802c279e7fcf758935aa662e SHA-1: 271176c826dca7204e997d30f264cf57b5cab52f SHA-256: 9219813e681eacadbc639bdd029bddf6014bee9750cd86045e7ff6ec67da0a8b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which appear to be compromised or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO poisoning to redirect users to harmful content. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link farm heuristics and malware detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://soechi.id/userfiles/file/nunukedud.pdf In PDF document text
    • http://sclifeguards.com/clients/16854/File/59313713252.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/mapenusavokakenujatimadot.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085d63bb253d---73309286718.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/riganejili.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/kadaxujufusatudik.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072196818df1---sifabu.pdfIn PDF document text
    • http://beiks.info/public/file/19103455108.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/40638421553.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/4q31ijje2459slaj15o8bcj9vg/rixipeniporarixaref.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7a0814df423cb866da2a68b9112de9d3/72316419681.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3f98c03982b7caec671563c624908c1c/26121308010.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ae819d1d---53358992397.pdfIn PDF document text
    • https://noddy.nu/images/file/11232950279.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/24475200500.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97eb9ad710---namaxer.pdfIn PDF document text
    • https://defaico.com/d/files/pevusam.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/negamorigegojirekidododi.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/07f3f7b03291061de37e8f439086405b/68271800800.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/28995815697.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/155219014.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/rujezizikixo.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/75359185993.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608eacc037ec5---wejaputodir.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/ripodotevuvitoromifesez.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607154291c82b---wirororawadobozajoxipe.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a03b17b517---18232062071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=about+monarchy+governmentPDF 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_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 16468 bytes
SHA-256: dfbf806af958a0ef08750aa8dd926f9393e38fa4920e142b4e9ca23d6195f5b4
font_02_sfnt_off0001386a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386A 10772 bytes
SHA-256: 0fb72b8ede2a1e9c23896ffdf58b0569b0b7d5a7449d8aad6146bd0ee6c60785

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