Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c92fb7c3b3d600…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 04:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3095e61f3b4deea29e40d94d78fa723 SHA-1: 117ed4c8a2b00d702bf360febd2ad9ed304ee7ac SHA-256: 43c92fb7c3b3d600923cb5944c815fef8c7c85a476b72ecb268d472de7159aa2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to compromised websites, suggesting a phishing or malware distribution campaign. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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.
  • 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://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/41277299102.pdf In PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/natasutafijizubu.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/97549367843.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/rilamifevavejefip.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/cbaoc9bj5f4oh7pg646ghs24oe/bomakenevegolerukemirid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333365aa490---13350563617.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/tonijolekidowedisufujoli.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/rusisogojofe.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/gazonitot.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6130EC5BBCB2F.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/geletarobanazojelasok.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161357b9d7d2c7---25097779437.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/66847355073.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/30335815585.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/rijog.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9696293c---ladilalilapigiwedupanewu.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/sibovoxa.pdfIn PDF document text
    • http://jonme.net/ckupload/files/gidedidofewelusi.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/ramunovugosikafokab.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/xipafepaw.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/nururesemigebozaka.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/boxifasukebuwasupugadobi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cbb986b11d1b101f50dfa01fd03533a6/kasebixijil.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/gipimikivu.pdfIn PDF document text
    • http://ctm.it/userfiles/file/9684128895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=365+days+book+read+onlinePDF link annotation
    • https://lapdonline.org/file/sapesewedigufevemuvexovo.pdfIn PDF document text
    • 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_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 10864 bytes
SHA-256: 279dad893a1781e071a0e7d453dc5e2cb116775c062b4792e0a968ce1e6b7571
font_02_sfnt_off00010c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 17608 bytes
SHA-256: e7c85122e1bb3d18906fc29d120db31bafb33cbc4e03045a47844fe9e14eb230