Malicious PDF — malware analysis report

Static analysis result for SHA-256 78928128847eb12f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 17:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6eac5b90927090de6045932f55d2326c SHA-1: 64f9249267b57a00abcb8dfd56e9efee6bb964d2 SHA-256: 78928128847eb12f1e0b3b757bb844193acb779fffe1ef278337c996bf16fc51
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to phishing or malware-hosting sites, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=hacker+fifa+mobile+2020 PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1d156752be367839dc35eff36ba00b47/kinafusutuwowebopitepul.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/sofezawik.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/97862562667.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/letulokemelujerabuna.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/43589087147.pdfIn PDF document text
    • https://o-dance.com/upload/files/pumabu.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/rulas.pdfIn PDF document text
    • http://plncse.hu/php_data/file/fanosukizo.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/79779188024.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4e3449abb34fb9fdf19d706d77df95df/74167769157.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/77994828909.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5vj2uqj87adfnvbtvbb2deevp2/13366659492.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/roxosusosatejap.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69725075094.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16132ff89f05ca---9927143111.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/najunibugef.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/95801263509.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/43698728888.pdfIn PDF document text
    • https://siroyensao.com/upload/files/tuwavewewapifukufurufom.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/kiboboxonunepavi.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/vajononidunufidixob.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/5875622016.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ac8529360---gumixiripediwurujix.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614890603278e---tazozokik.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/murota.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/18170676056.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 10592 bytes
SHA-256: af566c62d2bd6c0ec4bb00dc5fbf106a88defca0eb31fa124f8ac8848c09261c
font_01_sfnt_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 19820 bytes
SHA-256: 22d277694010e074669cacc54035fd83de5fb9de427a4a4239c0dd8a21e18a17

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