Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7b855f13e21ee0…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 15:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8189103e66beed3e10dbf154873f6c05 SHA-1: 5e496aa887cc12a92eda52a65d0881b0d41cda7f SHA-256: 2a7b855f13e21ee05d787dece2f4a8436cd9b39f39f71c1cb54bc40c7fc5dff9
172 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and hosts a link farm on compromised WordPress sites, suggesting an attempt to trick users into downloading malicious content. The presence of a visual download button further supports a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c250c8e87---gaxumaxowewobemukujafi.pdf In PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/fadbed32429adf30cc07ee2580fa1cda/75212676945.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613a365e9dcfe---ruvozigubigudaliru.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/rofovuzu.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/pugejivavagolojato.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/lewawazeko.pdfIn PDF document text
    • http://odumakus.com/uploads/files/48042756607.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219414230.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/45147573be4dcc8e830eef99d6fa66da/pilifegimobajuxixini.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/81130136371.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444f0fd1aec---50837471193.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/bosunapafepetubax.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/rukajazamevabuwuberojuw.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613954d65d1fe---fogisagufojizepe.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/36658609241.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/sukozulin.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/musiwosotobim.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d20692c1d6---16154417698.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/wimimageperuw.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/17992735788.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/bamofevowupumexufizanit.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/bumanakoromig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=environment+shankar+ias+7th+edition+pdfPDF 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_off0000d248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD248 10908 bytes
SHA-256: 156967595e083b465265004525fdcb62b7987455d49d26aa3562faa60defcf8d
font_01_sfnt_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 17140 bytes
SHA-256: eae057123e603c1d50e0477e433254b882c6922504fa5906ab658a5c30aa5354

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