Malicious PDF — malware analysis report

Static analysis result for SHA-256 253daaede60c449e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 06:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62b97071b43a893f2220e8fd759b7aec SHA-1: f8d757e555defd899fa4f922e7ec66bb2d1b7880 SHA-256: 253daaede60c449e1ab9cbe918af835d85a70a10a782d0ff9be5d7b4d48de7fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9a5e20b5---27127292716.pdf In PDF document text
    • http://essentielles-theater.de/UserFiles/File/vasolejope.pdfIn PDF document text
    • http://ipllaser.in/uploads/junofifuwufaxoverop.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/kojapokoruremarosekalusa.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130218c03753---dasisilaronozosovamivoxes.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/reluzimufesivuji.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109100902259627.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/vadulekibinawakezipuzired.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/funufezuwaroxum.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613df398cad1f---meviviruw.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/34541328422.pdfIn PDF document text
    • https://gangnampools.com/contents/files/davusasejumapenafu.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210915020136.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/weralogatajapemapeb.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb41f121d3---mafowuxumukowebunixixun.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/61621614813.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/44846956041.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/74769439115.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109131615134183.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/nazaxilafubada.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/21551465783.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/bowamutaro.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613028f95b8d9---kotojozere.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/tosoxonavujat.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///jexasotawunij.pdfIn PDF document text
    • http://zerosquareonline.com/file/jukosozunakijaxiwixusive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=wireless+keyboard+with+touchpad+price+in+pakistanPDF 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_off0000cf81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 11136 bytes
SHA-256: d518de5764522ac843a67490aeac2291d0b8560bc5f3f5172773c6e6678a7c63
font_02_sfnt_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 17464 bytes
SHA-256: 4317916c04e3f98c0be745da0cf249464b3b79245ed1da2b295a7c2d6c7646b3

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