Malicious PDF — malware analysis report

Static analysis result for SHA-256 804535fff80a91a1…

MALICIOUS

PDF

74.9 KB Created: 2021-10-01 07:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6e8e134d6de1394ddb37674543a7134e SHA-1: 8a89e8d7dd5e305e850a11e6c8dc9e8b890af849 SHA-256: 804535fff80a91a1205c8772a071cb00c873c3fdff2169be266b6ea5b79495df
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. These URLs likely serve as redirects to phishing sites or malware downloaders, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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 https://cructi.ru/uplcv?utm_term=can+i+see+who+saw+my+video+on+instagram PDF link annotation
    • http://hmed.vn/upload/files/12986059384.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/96320226847.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1204443023ddec57d0bd114cdc5a9596/92919379391.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/mibijipisasunakesilojuxu.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/fuxivolojege.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6632e2dd912bdb6bb734b85992ca7487/mikexim.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/ketokek.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/nozuzuloduwiwogijotabowap.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/73301808285.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/zupopexexoxigorapifomeju.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/2121731793.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4cbdcc2ba7403987aeff1e60683baf18/zefuvuromuberu.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/54534559086.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/252152071775.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/tuvavot.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/lumilobovuromijisowi.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/lozuvaramuroworete.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/51885364337.pdfIn PDF document text
    • http://fygl.net/uploads/file/02165543987.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/30343560200.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/takilogivow.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/99880865589.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC1 10948 bytes
SHA-256: d4cc3b283a642fe5f03ce2dd7a241643891e68776cbac32c16e2eb329470f4d1
font_01_sfnt_off0000c8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D6 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 14628 bytes
SHA-256: ce69fd1e7c372e96dfe01a5b3a5d5f6dfa84e62620eeb2393793b64b7a03aadf

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