Malicious PDF — malware analysis report

Static analysis result for SHA-256 71920ae82bf422bf…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 05:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a85ec18a9144810cc819585413cad809 SHA-1: 585ee712ec32a4fc0bc2da4e7263c976a13a2946 SHA-256: 71920ae82bf422bfb41acdba7c79150dd19bfd0458a6800225b250bf17c93969
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The heuristics indicate a high likelihood of malicious intent, with ClamAV specifically identifying it as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://inwebjor.ru/uplcv?utm_term=age+of+empires+1+for+android+free+download
    • https://theelementrama9.com/userfiles/files/gojaxuwezovuben.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161339ff9122cc---banusika.pdf
    • https://dianthusindustrial.com/resimler/files/mevibijimitamaxomamedix.pdf
    • http://thesecurityguardunion.ca/userfiles/files/68921133201.pdf
    • http://gpszone.hu/upload/userfiles/file/96446828825.pdf
    • http://fkjz.cn/upload/files/2021/09/202109170712252367.pdf
    • http://studioghittigargnano.com/userfiles/files/38340341467.pdf
    • http://savitaco.com/uploads/images/files/nekaporimikikanedogibuxam.pdf
    • https://gikguamerica.com/userfiles/file/nugumizesesaduxezixupu.pdf
    • https://daotaolaixesontay.com/uploads/file/xifadugiput.pdf
    • http://erictex.com/ufiles/files/tegisaladadofopukutes.pdf
    • https://funcarele.com/ckfinder/userfiles/files/62237330098.pdf
    • http://abwmechanicsville.com/uploads/files/76326097707.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139598fcaa97---91905926453.pdf
    • http://daltan.hu/userfiles/file/xedupaketoxosoronizojo.pdf
    • http://serextion2006.com/js/upload/files/dezirivopadosaxodut.pdf
    • http://saringkarnwood.com/UserFiles/file/21054932867.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f2aec095bb60a114b4ae3d103cbb1fe1/wewudorezo.pdf
    • http://pivotal-technologies.com/userfiles/file/bazuravo.pdf
    • http://ppogrimall.com/upload/editor_image/file/81552471358.pdf
    • http://thebookmarkcafe.com/uploads/files/99868288760.pdf
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/53323258656.pdf
    • http://paolacaone.eu/userfiles/files/61430163290.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/65495163845.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3ea7lrn1o7nbv78ea9q60l0rt3/donodine.pdf
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/xebowikiz.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_off0000dbe6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 16792 bytes
font_01_sfnt_off0000f3f8.bin
665c10b2fdf4fd507e2e464bd2d4e88e205bca9f5f703953deb080a9d29f378a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 18044 bytes
font_02_sfnt_off00012263.bin
2dd5c27d455d6060ed3b40fe136f14755754237ff3342d935a9c898f86cb3a4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 10864 bytes