Malicious PDF — malware analysis report

Static analysis result for SHA-256 481a18f069d646cf…

MALICIOUS

PDF

82.3 KB Created: 2021-08-21 15:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 983ac2d90d21c705f551105bd3d4e503 SHA-1: 71add6dc9d2f9d13603f0bda2c3da7b7b2528c2a SHA-256: 481a18f069d646cf46f8a774ebb93a8afe7149a0a667de72e7171aa0a2880d54
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 and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://xinyaoqiye.com/upload_fck/file/2021-7-20/20210720130131369829.pdf In PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805733b2ad7---zozupepizona.pdfIn PDF document text
    • http://24cvety.ru/upload/files/50429893794.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/34718bb5b1365c3f521cbcf29276947a/46356896336.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b4f8c5c4b---54472514262.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/16200904345.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/19720160971.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/52803010591.pdfIn PDF document text
    • http://citra.cl/userfiles/file/38328627718.pdfIn PDF document text
    • http://sdds.be/userfiles/file/58547634923.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d16820dc2af11e8a630f791b315fe67c/jepixi.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/21679696411.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a706f0eb9feab008357a72ae787644a9/vaxone.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210619_4D213EFF8CF7C633.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d25909b8---nexixup.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/niroduvew.pdfIn PDF document text
    • http://canoeing.by/pics/files/farapovu.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/kesusujup.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8b20f26ab298f54b1db379f6232c65e5/49916003809.pdfIn PDF document text
    • http://thaide.org/userfiles/file/wegutobebajefil.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/1460615055.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/32214639446.pdfIn PDF document text
    • http://lottfamilyreunion.com/clients/878857/File/24944951915.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161028cd86c3ad---mafuzolubatidokenov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+calculate+with+vernier+caliperPDF 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_off0000dd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 10544 bytes
SHA-256: 81a567e93583129b049f57b771f7a8883f1f98bb46f5635d165c88fa1a5c17aa
font_01_sfnt_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 17616 bytes
SHA-256: 09fceb5129691cf3f04b756469ea6dc83cfd804a4c258a95423d8dd4b392e162
font_02_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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