Malicious PDF — malware analysis report

Static analysis result for SHA-256 187fc4943e3c64d0…

MALICIOUS

PDF

74.4 KB Created: 2021-09-05 12:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 776c62448b7563845d535bb4df6b5158 SHA-1: 40cfeb07a32b67991a2efea77d87c1a7424fd323 SHA-256: 187fc4943e3c64d03a9807c9812af0ac6b0aa359bae1ad1c621a7caf81b43a24
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely serves as a phishing or malware distribution vector. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d32152d4fb---89002763192.pdf In PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b1f3e4fbca932314a8d128d1a7a7ab71/17287348815.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/dipakidisemu.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/64279979806.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/pororivojokibak.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/setipelebepuzuzuson.pdfIn PDF document text
    • http://splogservice.ru/content/files/datujo.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/98849404980.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dae4599621ba713c297aa52b34958bc8/53694691466.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/sawogumemopesujukatage.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610f36bdaed19---6314388415.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608653bed71c9---fupuwakilevefen.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca847a6df4---51447137344.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e736ed16078551dd23f2244422cd7fb2/35380517421.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/2348276569.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/62324066584.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/wuwodajuna.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16103a1d90176d---62442603120.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/lugupedifijokuxaver.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/54032031230.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161271d4924cb7---marokisapokijiva.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608231b2dc0ce---rivajojezajunazo.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/wolilumanebivemoxekupe.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/pazonaxejuzi.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/64197241760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=environmental+law+reviewer+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_off0000c083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC083 10624 bytes
SHA-256: 88f4c59999e4cc82aa35856da123c73d082cb9b74ea76c00d0d97d98ea2eac16
font_01_sfnt_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 16716 bytes
SHA-256: 33954aac2c1cfa147f7d0de69252babf7fbf65e49bbf607fd96b938e7df9f087
font_02_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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