Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3e8f588b131431…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 02:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d2b3d24cb04fec62fb79cfcbed3c345 SHA-1: e516ccf5c327e7bb0f6c8d21c3b3a7aa037880e1 SHA-256: 1c3e8f588b131431f2dbe347d3830f8b81db5638db8f83c08afe44f21d06d6fb
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://xn--989ap7r0xbd5x.com/upload/fckeditor/file/tapikuxopukamelaju.pdf In PDF document text
    • https://infiniteprospects.com/FCKeditor/file/10228989400.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5948bce9179ea66a01108cda3227b7cd/xivesapezuriferuxita.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/tuxikapafuwozi.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/fijijikozobopeduxer.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/9a3c601c68446bc67138c023fc94a716/variwusiw.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ipibfkcldqlos88assev5inchm/mutuxesusevexisi.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/66f4ei1nafevnabdk2ugadlsv1/dekiturigizo.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210816145534.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/917136119.pdfIn PDF document text
    • http://air-con.ru/upload/files/27905987541.pdfIn PDF document text
    • http://rapet.hu/files/49137630213.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/fubamixatamemalerudu.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/jikorumirozasiw.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/vrhk709prirdqb5fv9da0b9187/11566255733.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/cdd2ce3c9af1b6e05e710802e9a89db4/43275234164.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/jabobipilamazijo.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/jidemetinavagukivivezuz.pdfIn PDF document text
    • https://kueapem.com/contents//files/39268161390.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7989c31d4a---94392308905.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f38422b135c1fdd87313588e896f1f5d/94559649259.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/57684624726.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/wubeti.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608675e7ad9dd---genatujevarorofotif.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/84153608702.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/22caa18048dcec214fb60cbeec6322b6/tixuwopovilasuduxadif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=shelly%27s+seafood+%26+fish+marketPDF 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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 10280 bytes
SHA-256: 1149250542e6d76f3f8c3a28e0c2aba0ac51c8add6407a2f73cb60e366f68344
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 16680 bytes
SHA-256: 52e8680d2587e3cc8048df12b46ddeca1b4e873df30767bf1872d41d56e942be
font_02_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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