Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2afa78f4bc4202d…

MALICIOUS

PDF

82.0 KB Created: 2021-07-23 08:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23971790619852de2badd06c3bec4422 SHA-1: 6139dff12e4aa8fe11a619b2e998fd1f18fa6d70 SHA-256: a2afa78f4bc4202db3b555be354aee8739bef49a2ad3159f104e6ad6c27cf663
176 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of a QR code lure further suggests an attempt to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smartvoicecom.com/userfiles/mutisepetex.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/v1pu3sltn3u4bmbhbotnl3hru2/35995661164.pdfIn PDF document text
    • http://beymersan.org/upload/files/bufuxeg.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/71941995278.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c1547e3f3---guwig.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/310423304045.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/356941e5aff4a644c742c2949879a594/xazot.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/rufegixipopilojikani.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/75791927746.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/5642937130.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160adc61893377---49228207810.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/99108589228.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0ff8b7981---1405071004.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/61398059850.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/66403b2ec0ec0fadd1e5fb6e5ceab18b/73324456782.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/63496101a57e122ed8a51cde7784d18b/50978443542.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609300771f86a---bituwelidovosox.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ddc7b8d5e---wiravowonoserox.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/74543547884.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/nakisowelozikelomisab.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2912cdc32ac8cd7d03a46e8b447b1981/48303045789.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/81382158862.pdfIn PDF document text
    • http://martonelektro.hu/files/file/27126256262.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f43a3ad9bd---53264601141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=1+and+2+multiplication+worksheetPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ec000efae---suboxidu.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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 16816 bytes
SHA-256: 66bf2574213edd678840e47d59a4ec5915e5de9a03c30ea8c4352a0b16ea2919
font_01_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 11132 bytes
SHA-256: 29ff69bac1ece80da92de3371aefa730757c3de528314a3d7fe3651ebfbf0cce

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