Malicious PDF — malware analysis report

Static analysis result for SHA-256 40476f033eb876b3…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 19:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 920a51e029ab049c1facdcf1b67fce23 SHA-1: b6aeeae936dcb81c88ea7219ffd6c3dbeb925b51 SHA-256: 40476f033eb876b3416e612457b6639dae0bc6a55fb36dd8cbbe401983ef7f3e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://huntic.ru/uplcv?utm_term=shahezad+kazi+bandharan+book+2021+pdf+download
    • http://metabolitplus.ru/files/file/kokomevedo.pdf
    • http://expresskaliski.info/file/68420214244.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613025185b3b5---radozigopiravi.pdf
    • https://webkapper.nl/ckfinder/userfiles/files/gemijonij.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/13988878214.pdf
    • http://thechelseaff.com/user_uploads/files/lujakus.pdf
    • http://foto-klub.dk/userfiles/file/60162557189.pdf
    • http://iglozawiercie.pl/zdjecia/file/desax.pdf
    • http://madurastones.com/userfiles/file/89534292335.pdf
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/61601006577.pdf
    • http://solamsys.com/userData/board/file/51207774282.pdf
    • http://mikol-styl.cz/userfiles/file/sidagukepifunopadixunorun.pdf
    • http://saconsultancy.com/userfiles/file/texovaporovopago.pdf
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/wixubiginozaguzomaborojo.pdf
    • http://marcth.pl/media/fck/file/51311052611.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/2b4d6d07ef91dd6a00d836765865c4d2/56871236833.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362eb8412f2---kafosabagivid.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/wasuvete.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7b245e6c7006e65610c02a61b5b86eca/lumaribezafetal.pdf
    • http://sparan-art.ru/ckfinder/userfiles/files/8003846153.pdf
    • http://jcon-aps.dk/userfiles/file/godemudezapimigiroge.pdf
    • https://edenestates.com/ckfinder/userfiles/files/jamofofadirewilipogaka.pdf
    • https://jamuiboe.com/webroot/upload_media/39503657083.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/33554061993.pdf
    • http://e-skala.pl/userfiles/file/32472633044.pdf
    • http://neuchina.org/userfiles/file/nogipoj.pdf
    • http://talleresjpg.es/img/file/buvitevurotezatunebisaz.pdf
    • 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_off0000cab1.bin
ce4e318b3e9a3e6de940b4efbd1c48c670c46066189be8437b55b1bf231473fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 18268 bytes
font_01_sfnt_off0000fa1d.bin
1af6f753e58521ab4739cddee15e61b8f326d2252eec2d3707fe120daab91c8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 11076 bytes
font_02_sfnt_off000113c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113C7 16792 bytes