Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fecaba2fbeca65…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 19:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb950170c1c40abccf6e3e61ac2b7d1a SHA-1: d985b89c60ef8cbc831d84db2cf7001da16ea983 SHA-256: 40fecaba2fbeca6504c75489102c4b950e66e945dbb8a984cdeb92d1b76870b3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded links and the nature of the URLs point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=indicador+prevenci%C3%B3n+de+infecciones+por+sonda+vesical+instalada+pdf PDF link annotation
    • http://creatinglifeoptions.com/userfiles/files/wozore.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/27992998219.pdfIn PDF document text
    • https://funbugs.ie/files/file/texekotixal.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7d1b37d17---57934377691.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/zorabarij.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ece34567543b76248010e9215d0fd569/97236821726.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/geninuzewejiwavobafim.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59b12903c---tivegi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161413bb249b5f---towogav.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/p4dj7g39stm2eslsmsmmdjk1l5/35850668914.pdfIn PDF document text
    • http://gurmanosypsnys.lt/userfiles/file/jetulutifiwobewavap.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/61219965796.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc0534c137---bowajubivobezazuvoti.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/71728089616.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/62203884766.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134bdfc429eb---kelegabilabaxasofi.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/39400398937.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/konoxew.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/mudedit.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/juxosotateveledudomub.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/6ada6484501b9f3ec2acdf88445bd54d/60381888294.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_off0000c367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC367 10768 bytes
SHA-256: 6ee95eb4ec5a165353c8f26bcf980d923716000f29e88b388d12719f4f014b84
font_01_sfnt_off0000dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 19236 bytes
SHA-256: 7d32c0130affc22fb3fdca09ec124098499e2cfc705d42ab79a72e86c81b5984

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