Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b05496c49f4b5f9…

MALICIOUS

PDF

70.5 KB Created: 2021-10-04 10:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 04252fa539016fd1820b3860a3692a80 SHA-1: bda834052fdacffb8a9943983d97001596b77c52 SHA-256: 6b05496c49f4b5f9f52c8958afa7bebdcdbdb2aa571b640eff717a37e1d582bb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, including those hosted on compromised CMS upload storage. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://pasquarelloplumbing.com/UserFiles/file/25792697343.pdf In PDF document text
    • https://censcakmu.org/board/file/files/dumaremakemezabafat.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/53993501884.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/sosilowefasibemizo.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/30225716811.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139851cd6e6c---moridul.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d26b44180f---warosesatop.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/zugilelagopitazamox.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/sigotalebif.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7fafdf9812cfa27c155739c7124ea899/71758136015.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/74757079716.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/sulotejizigusuxejexototi.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/1634548230.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/73398522141.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140f8ad522e2---vozejijukofuvomivus.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/28569302930.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/tufejujofitiwipe.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/vikexoxebur.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/seruxanilonotoxilozakabij.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc98be773d---wewijewomaxamab.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/lixikafazaved.pdfIn PDF document text
    • http://otczenacts.com/media/files/timitamifo.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/mupedutusan.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/firomu.pdfIn PDF document text
    • http://stonebreaker.at/wukuwavipe.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/52808614421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=being+an+immigrantPDF 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_off0000b567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB567 10168 bytes
SHA-256: d1ee0d03a6055b640496334bca18fb16cbe5c75aa3634fcc345fbcb5c1829fd6
font_01_sfnt_off0000cc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 15960 bytes
SHA-256: 69c9a4e71784ee144bf6bdb84e3b9b1176450d7cf8dd8dbc81b249b4f5a3a1d0

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