Malicious PDF — malware analysis report

Static analysis result for SHA-256 3154677cd563e0b7…

MALICIOUS

PDF

90.0 KB Created: 2021-08-12 12:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8bb596a196be00fed14bb3f1e728a970 SHA-1: aeaaa7d58ab7bfe060bcc81df7e6c907e94e0a24 SHA-256: 3154677cd563e0b74ce62e454ef06f3acce33e78df1bec66e2e4eb8863ef58ee
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous URLs extracted from the PDF point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the nature of the URLs strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=how+to+keep+track+of+petty+cash PDF link annotation
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108176690c9e---54791132798.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091967ec7c17---96767315106.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/70581232058.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/97717904142.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/kaziw.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/37929512105.pdfIn PDF document text
    • http://ned.ru/uploads/files/26452096765.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160984fc6af3d6---fowanunu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3ee8d2dc3eff2b17a8c60bf15b5fcc98/bepuzozemekavitajo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1jh3ielj1b7t4m3j7k7vaq4he7/kesawikavosoxoref.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/43889381451.pdfIn PDF document text
    • http://flexicourse.cz/res/file/vogoxavunadovenusowekibo.pdfIn PDF document text
    • http://gojjang.com/uploads/files/98719137270.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e31143568a3---kejufumivudig.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c902e330253---82624180657.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/72778295437.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/gobixarijufim.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/baf541a893070adba7be536af54b074d/88512923959.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/20768157397.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2e43ef8d---7880539445.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/38416218735.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/4f30e0aa520195f7fe353bf496bc87f0/tisodurowuwebedabexadelef.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/64151034c0e8c8f01b3c01d6acfb35ac/12690658727.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9981487f54975e79da17f36c5c134033/faxukirakazetirafim.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d96b5127039---55504848123.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_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 10620 bytes
SHA-256: 7cf5e4b9d5c41ff39a55ada68d09b5a3533e89aa8735dda201fae2f334dadaf3
font_01_sfnt_off0001132a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 17952 bytes
SHA-256: 80723922038e1c3fe4c1ecf05dc88824e158bd8aaf474c23aaed67f9c4c6d189

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