Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a7aaf9aad511b2…

MALICIOUS

PDF

170.4 KB Created: 2021-06-27 16:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f632fb8eef137457c5cd75acd71736c SHA-1: c63ee2ffdac7a76fb4d318cc0c6f194af9a8b98d SHA-256: f7a7aaf9aad511b2539512ecb60300d9314547852c719ea8edbf76fcb155ef72
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://cancercareresearch.com/userfiles/file/95241650664.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/nsnh0ndnih9nkgkm677i2q85cs/sojuwibukuron.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/59456402307.pdf
    • https://artbynela.com/uploads/file/9336005076.pdf
    • https://childconcern.in/trila/userfiles/file/47217720549.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/3ab81710d0c5a4aa2326a7e18aa43174/61883061044.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ba3d5cec497620dce37507dd802c00fa/suxonikonaditileleruzat.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/6475821356.pdf
    • http://architettoseneca.com/userfiles/files/sinirofasexa.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/bdm0ii14icov6479u7dti0ue92/zimeworofelopazuzigofizug.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d86dfac19bd---67104363271.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/85u78jsoe46he677tbmfsd0kpc/ramikivokizovapuvojajexo.pdf
    • http://fedoro.ru/upload/file/xonenafotadubosunamuxo.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/dt6dph1eanakktjihvmlpofj62/feluwivewuj.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865e37a332e---zimisizogarabobivozapo.pdf
    • https://agatanorek.com/files/file/semuxosifosabe.pdf
    • https://airbays.com/userfiles/file/94607157657.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b75d25c56---82301085045.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/jevaxidokiguxuvotul.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/472iplthrmj05lqedf1p3fpdv3/21718954476.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d548648710a16a294c56c5da637c91e9/dupixonaluzejemakonixex.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607104764fc8a---sololutepigimopifeke.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855afe254aa---papigoke.pdf
    • http://biotop-zamosc.pl/userfiles/file/fumodifuwagusovateke.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=all+ages+nude+beach
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000237b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x237B2 16792 bytes
font_01_sfnt_off00024fc9.bin
9e38bca8656cd6f2732deb57f6ce2d69ab16ab41d9a13992584ea97a2b6e2b05
pdf-font-stream PDF embedded font (sfnt) at offset 0x24FC9 10460 bytes
font_02_sfnt_off0002673c.bin
646fddca7bb3c5268b4d535b394c428dcae60d3f0f19e36b2cfbd150952c34cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x2673C 20340 bytes