Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0a22321cd82a67…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 13:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc365fb85aa6bba3df11c9fd752c908a SHA-1: 6fc0b21180fc4461791ff4e3faa3066de63db223 SHA-256: 1c0a22321cd82a67b046a57b831226c8648ae9306d7a856ac17b361ae33f2c9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344e40090da---50525962667.pdf
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/mogejivotiwukugusitawol.pdf
    • http://nandishoverseas.com/UserFiles/File/gisenevisij.pdf
    • http://allineers.netlovestories.com/upload/files/16616151149.pdf
    • https://walkandsmile.com/userfiles/file/10355770196.pdf
    • http://sb-78.ru/files/file/pojozisuborapiwadusivo.pdf
    • http://hoadon-dientu.net/images/files/11318669051.pdf
    • http://chip-chup.hu/upload/file/92910161296.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16139d17dc8087---kinekoxo.pdf
    • http://stark-tools.ru/images/uploaded/41802389393.pdf
    • http://haohanlegend.com/Uploadfiles/files/bozovibobavilokofifig.pdf
    • https://jgranit.pl/userfiles/file/nuvedavenonaz.pdf
    • http://rakkhunnursinghome.com/user_img/files/litanatolewerozu.pdf
    • http://expnavi.com/sites/all/sites/default/files/file/mixisopasefezewutanopiso.pdf
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/rivupapexux.pdf
    • http://abwferrellpkwy.com/uploads/files/ruwawatumusajo.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ba3hbmiao54sqbs7bvbh2613vi/53901183928.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/c3kakginkfhmchgqq4lq1jnojn/molixevarowabej.pdf
    • http://estatepie.com/files/userfiles/file/5459397829.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/61722296446.pdf
    • http://yuqiaohome.com/uploads/files/202109050736199821.pdf
    • http://applexin.com/ttpsea/files/file/zapanepivuwizola.pdf
    • http://gojjang.com/uploads/files/jumono.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mk+vs+dc+download+android
    • 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_off0000d8ee.bin
41cad7f287c1418f6d3f8b8477cae0c4bd77f1411d07812ed49ea5d627fcfb8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 17160 bytes
font_01_sfnt_off0001050f.bin
43a478c1c00e536c5b3812dce05b11d9127dac52be721e5c19e4c94eff1c8dfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 10368 bytes
font_02_sfnt_off00011ca5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 16792 bytes