Malicious PDF — malware analysis report

Static analysis result for SHA-256 99826bcc140f4c1d…

MALICIOUS

PDF

77.2 KB Created: 2021-08-28 02:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 14895327ba4276aba2fc4dd29a89539d SHA-1: 4aae088ccd0dfdc7f73c658cecc2cd78f050f705 SHA-256: 99826bcc140f4c1dadfbfe2faaf9398a4d396003e7dec7b008395e2eecde10ae
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and trojan threat. It contains an embedded JavaScript stream and numerous URLs pointing to compromised CMS uploads and disposable hosting, likely serving as a link farm to distribute further malicious content. The URLs suggest a lure related to 'lunch box delivery business plan pdf', aiming to trick users into downloading further malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 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://crewmak.ru/uplcv?utm_term=lunch+box+delivery+business+plan+pdf PDF link annotation
    • http://fine-trading-knotwork.com/uploads/media/vizemo.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/90756965461.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/nuvopem.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/jojepufepodumusujen.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bffc49b9b4---28691860784.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/zejajakokejalamepidapuder.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/votexepakobef.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/rapusevasew.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7ff4970c1---tewalafobon.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c78d69dbc---xulojelefepadedegapil.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bd783a451---mugelotevuludunejim.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/58399309817.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3d12a2b1440496c8d5c809a9797d3ada/75030311599.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3320572dc---wenuxedodegusibifuk.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/lebopetuxudubuve.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/08dfb5f1c1dd5c15392401230e9157e3/gefitudukebominasaviwu.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/fufolakuwerebigoro.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/xuxapobarabusatexit.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/95219397750.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/poribatiban.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/virusenufinokidivuna.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be988947cd8---24776117191.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161087575d2194---87671830959.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607399258e84f---67768908828.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/78976224128.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/2673907199.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/59383931033.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_off0000ca7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 11096 bytes
SHA-256: 42943708e124a6a5fa049540593eff54f217e59ed23ecac0d1d44e85f8075986
font_02_sfnt_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 16400 bytes
SHA-256: d1be96a2e388ed41fea692a9d2a7cbba10e8c71de6ea93d8e10d89f7e28a5938

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