Malicious PDF — malware analysis report

Static analysis result for SHA-256 3046bd990d9aa51c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 18:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0742d5e0d4d626862c518adc5e7d64d4 SHA-1: 1f6b133eabb52b9605015b0d5f7bd3f797bbc5e0 SHA-256: 3046bd990d9aa51ca5cb570ac20840e5731c0bf5d269d5877c54fb22412185a1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. The embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bfb6abcefeadab94c97fb254e6849d03/sofufoxar.pdf In PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/sufubejazujodijunin.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/17697428169.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/83821807264.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/25547220206.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/gisagiguzofob.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/xilipazetaveti.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/nakolawuragane.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/xoxaga.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4d96a060---5937527944.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/db6f7d89265bdfea2686fccda77ca1ff/kabujuworikozabozofesate.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5c4e396d5---munulozupojewukotepuku.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/76678854282.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/7c0d7d64fa5da9130810b409188cb2fe.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/65786017467.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/8825387046.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedc281c4b---25561073926.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/22352943821.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/1408598738.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/92276902424.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f3fdb3a4ac06ea9728392261a66c408f/faduvebij.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/bakorudomijuvavobafiluni.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/seboxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=livedata+unit+testPDF 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_off0000dc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF422 18844 bytes
SHA-256: 40148f066e0637ed26f90b9ae02fadf792380db5490fc3bc65ffbb83176eb46b
font_02_sfnt_off00012664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12664 10100 bytes
SHA-256: 6072144ff98e24eb2c18074addba7aa4fcd9a9c5012e3c6a75e8f382dc6061df

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