Malicious PDF — malware analysis report

Static analysis result for SHA-256 22edbb4203a44f24…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 23:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a571e45e3e134d8c3b3b9b4555fe58e0 SHA-1: dfdbf5a40df576fd49b410e44efc01b42c9b93f7 SHA-256: 22edbb4203a44f24d7c9636afd3ccc14b0bd0ff97ec343d7c38b1d1a81e1a5d0
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites or phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785e0764bd6---14753211659.pdf In PDF document text
    • https://semagro-msw.ru/pics/images/file/seselokawujajovotilesewal.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210720204641.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/xasez.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/pisidafazewefobekog.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d680b0a333---97647194845.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/22575089319.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/zutukiboremosetotozifol.pdfIn PDF document text
    • https://europartner2.pl/uploads/dadinike.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/wotivipejaxomuz.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/1167305467.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/zabipaxodan.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d4efb8d91---rulijuwigokefikunav.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/96382404826.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/28f87sb0v0489l7e35v5f350kt/pekaraperasadok.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vususifot.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/79676969951.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5dc160975ab9b9c85849b1caf09655d9/67626329667.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/97f984d9216572a4cadd0d94004b8460/kubojowawopibafubav.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/kopadup.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/4bf057a6bf8b44d90703530b564e2918/pagop.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096a05784ee5---vopoworiwevetivora.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0db18008456b77f9b96c58d1d776f934/41903980247.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/kovuralorupadevobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=active+directory+l3+interview+questions+and+answers+pdfPDF 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_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 17452 bytes
SHA-256: a505d59cea67d0eb8359bfc40cd07d7f4ee0d1d0b5fa677f49016b07924dc9b1
font_01_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 11280 bytes
SHA-256: ad9460eae84f9f6aff45c9b64600837a0d12847f4e0e4d9c4d94b8fc7b32eb97
font_02_sfnt_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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