Malicious PDF — malware analysis report

Static analysis result for SHA-256 5246b192ee9de0f1…

MALICIOUS

PDF

87.3 KB Created: 2021-09-12 10:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51d71516a392439592a580e25bd473f1 SHA-1: f07969e644f2a580094a6acf7cea6c2e4e48658b SHA-256: 5246b192ee9de0f1185a931a00c4d2d1ffad36aa02e4d07f4c6b1ffc94aad97c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable binary data.

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://kingsap.com/file_media/file_image/file/85726401207.pdf In PDF document text
    • http://www.annaleehuber.com/content_files/file/46225384773.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613848da734cb---75253523558.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/rovelu.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/wananexepuwukikepukinubu.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/ruvufanenijubakubapu.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/67520448939.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/zusediw.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/93812745571.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/sabaxumikowarax.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/govowuwi.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/xoroxeri.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4dfd85c1b---nowakabefarulalogidapib.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/70453832877.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/35790795423.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d18dea1c33---debawegumelewenutitalole.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/15186855805.pdfIn PDF document text
    • https://profm.hu/files/file/kojobip.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/23999986232.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4b65ad9a6---5846835600.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/gepuxamowurilipexiris.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/55291983786.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/27624644619.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/35521984157.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/90437812338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=update+windows+10+32+bit+to+64+bitPDF 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_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 18740 bytes
SHA-256: c449495c1a55434f484c26aba350d378dabf4bafb2c37361cc0b579a5667b6cc
font_02_sfnt_off00013501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13501 11184 bytes
SHA-256: 0bf9d3a2b96a76fa821ed9b3680333be46e9a6451416e9eca4e51fe829c5d404

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