Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2141abb04ad41a…

MALICIOUS

PDF

87.7 KB Created: 2021-06-25 21:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 715a88f29d0b50b3485491893627a737 SHA-1: b78d4d6ddfeaff9fd61bb5a06f1c417b556119f8 SHA-256: 5a2141abb04ad41ad206a49167fe4cc7f2af7280ef9a0f1f16b818ba3cb6b1d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised websites and disposable hosting. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9826

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://pistant.ru/uplcv?utm_term=tb+can+be+cured
    • https://caffedisanto.it/file/xisopuzuwalila.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8762d5df---96267725818.pdf
    • http://cuacuontoanthang.com/media/file/kasisobawib.pdf
    • http://cpgny.com/userfiles/files/61181828638.pdf
    • https://strategieb2b.com/userfiles/file/zidisoxomugekikanuvovur.pdf
    • http://flirdining.com/uploads/files/wunanuxibenasafosakakuzo.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ce52dda5a4f---tedagubolidaginuwofik.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4c34cc62f61b1dc8da0b5c0a58346fc9/gojesazijokedobe.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/sikukatatotowili.pdf
    • http://degrossier.nl/uploads/file/76055629878.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/167e4c1efa72d9cdb37807b0b2906971/xobezosaxaz.pdf
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/56644518419.pdf
    • http://casier-a-bouteilles.com/file/62171381261.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/889324163433bca4770150ed5a6e0df3/rakurutokalavetafizo.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc7f3d9a5b---jejugirona.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160802fa306956---99117526595.pdf
    • http://arniestribu.com/campannas/file/vojomolexapig.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e163b9ebf5f3f38b8ef59e3b9fb9206e/58210821847.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cb67691d---91476352554.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/89514876476.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/gexolobamigadovepixawas.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608988b2ce8cc---ropejezonigupe.pdf
    • http://campfirewtx.org/userfiles/file/62738515051.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/0cdd2a16ecd42e327fd8861d86e9147a/vofasof.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/d551eelj0bf1nra4tcpfmcug32/58016837557.pdf
    • http://szao-spb.ru/images/news/file/35594021678.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_off0000f592.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 16792 bytes
font_01_sfnt_off00010da4.bin
677312aad7ff57a79b3fef537f17b5f7c652047a058d0160828f3557bc7b7e80
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 17356 bytes
font_02_sfnt_off00013b23.bin
d4900ef794a2743eead24fdb53528ca266cb1b537c01d9ff1451f2f119b5e822
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B23 10040 bytes