Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bb79d7b3b3aa86…

MALICIOUS

PDF

84.9 KB Created: 2021-07-16 05:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a29505ffe8ed017104759af71479ab4 SHA-1: dd01e99b097201c1cfbf66ea19347bd9a00e2cdd SHA-256: 90bb79d7b3b3aa8675bd0fee41c8af2eba8fbff990c569b12e5a0a75ecf0805b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/f87a577ed22f303272d38aee64ad1b89/laledavosuxusixozikejoxip.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a290d9fbe---ropig.pdf
    • https://liniagdanskzydowo.pl/files/mazejerozuv.pdf
    • https://sinhadventure.com/uploads/file/23936992500.pdf
    • http://zs-oilfieldequip.ru/d/files/fawovaxarixikutufidodasif.pdf
    • http://veronikavilla.hu/userfiles/file/vasunujavuvomexud.pdf
    • http://dlt-nkp.com/fileupload//file/23161591260.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/40ffd00e4d35109a06386e72fb01f566/zulisuja.pdf
    • http://aitrans.cn/UploadFile/file/F1202106021431218970.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/pazidofelulox.pdf
    • http://files.ibiza-ferien.de/file/92996969965.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607001429da77---fetugovogamixo.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/q9alkcsg51t2ve0983t7skg2b1/tedume.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8662022f9---7292167169.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/7b3920fa567a4ad2855701dac0745f26/46841149523.pdf
    • http://barrospizzadb.com/uploads/files/sobotanugolofajego.pdf
    • https://mttrasportisrl.it/dati/upload/file/85570985262.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/1c0207f82c3881c79ed6879e79cc9b15/41831424232.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096f514614d8---86547939735.pdf
    • http://614move.com/clients/4890/File/63086578268.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/67336151810.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/cdehigr2h8f67e2lip09v32ha7/22658815594.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1de498f4a2124dcd0297280ec59421d0/74395431789.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/uu5ihvlnkb89g88ene7uvi7t5k/33005118637.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ghost+hunting+near+me
    • 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_off0000e9b0.bin
bf42e2a23855d5cae714393926ef05775ef605e4d2b99561291be8b5c4298a5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 16620 bytes
font_01_sfnt_off000114e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E9 16792 bytes
font_02_sfnt_off00012d00.bin
9a191178776f295fcb41625327f3368f02e40648fa244d22eae3a3ec1f00ae0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 10648 bytes