Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb5ba598dc7dd45…

MALICIOUS

PDF

97.9 KB Created: 2021-07-09 21:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ee8048b8248550500798c14283942a8 SHA-1: 2e358be97f3aa38334e7fe69a6aa4afdb5c9b82a SHA-256: 1bb5ba598dc7dd4580c530fa9bd01179867ef38608feb01cd9a3b0a180dc37a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9169

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=be+freaked+out
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f290207ce---19307391625.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4e734922---58189645186.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160969fceab2a9---36002462976.pdf
    • http://theartofdesign.nl/ckfinder/userfiles/files/13183081886.pdf
    • http://citysuji.com/ckfinder/userfiles/files/38584285602.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/af6dbb699967bdc854fde9cfd9b8bd5f/59558649277.pdf
    • http://foto-preiss.at/upload_files/files/sisoxiwiragemasojesavago.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8f7ad6bf53eb8f64f26bcfa373044316/44847843127.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f92f6368cf4cd207c5ffb8ce8aa2ef78/mupijeka.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/a57b94618c83a776047a358b997440b5/xakev.pdf
    • https://childconcern.in/trila/userfiles/file/wujagifagopijorevivoxina.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3a9b55eb---getuwuzaxuxegulomigiden.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0304df49---84506371692.pdf
    • http://ac-kenigsberg.ru/files/file/wofebapimetabopo.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/47794726321.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608730b876aef---fodixexejuvov.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f79741a74f---xokalefodelumowuxar.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6676c3354b4e87c437967add52753ee0/perebapineruwekorake.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/nk4o47vasf4uds2uogq5f3dp3p/jugogademapeveto.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa615ec4d---zewusofenunabimowutilerij.pdf
    • https://www.paseppe.gr/ckfinder/userfiles/files/xofanonidasasufanomos.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d578b2155a---tipus.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ajg2iaegkp1fpv0vgea0mna4n0/solubokalejefopu.pdf
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/244d63fcs0rarb3fpndequ7aqk/50947577719.pdf
    • http://e-cluny.cz/UserFiles/file/49430541649.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b7922e304---sulolarewonax.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e451.bin
4e5f5474fbd5bfec830886c076184a389a9b29633d831b71ed1f5b178e6514e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 27364 bytes
font_01_sfnt_off00012213.bin
782b9ca184b7b5d1bcdb4536c3a0ef0538789fff0b639f672e331100eb6eb244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 10184 bytes
font_02_sfnt_off00013912.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13912 16792 bytes
font_03_sfnt_off00015123.bin
8e776c84640b1e21d80f6fee8cf76d3e3995144ab64441f38557ab3206a7a025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15123 17776 bytes
font_04_sfnt_off00016c98.bin
8dcd35bf4bc4316dfe22b2693e3d1d7c0533bf2d71f106246cd67e42c23d6a8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C98 2648 bytes

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