Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef71a3fa1bfe390…

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 13:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5680785043ccb728cd20a2ec8b019e47 SHA-1: 3430d0c0be477d3040074d460d5ed8a959f012bf SHA-256: 1ef71a3fa1bfe3906fb8b5d11e9b2702083358602011f622785ab17f94d8dc16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://sjanzee.nl/file/nivitadezokon.pdf In PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb288e4c65---23571892821.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/19384804121.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/49072067418.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/bofuvakipebebax.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/nomexoforasukog.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/nitozivewafisopus.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/sevoma.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/duliwenivosogower.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/83725409431.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/60394035825.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/gaxadujagim.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/kabasepivivagenef.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff82372b16---xeper.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/24352166280.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/uqm64fs0ne389dbafecsjfgtgp/nuwenewoxoxusib.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75133871474.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210626_36D39176C523ACD1.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/liruvivevazirunelabetexi.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/57967356859.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/64028994258.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/fizekim.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811de5d00a9---71496096769.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083de3371486---kopufesuwi.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/1498370b3706598682b9723f334ca7ec/bavegijoniruvunesu.pdfIn PDF document text
    • http://preiss.at/upload_files/files/47717371184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=iso+10005+standard+pdf+free+downloadPDF link annotation
    • 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_off0000bc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1A 16956 bytes
SHA-256: df470a91737969da50d69836bbaa22ec8d89348c9ae4f8453cca230257f47d98
font_01_sfnt_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 10744 bytes
SHA-256: 28c82a0d05880e3916985146934ee0593e77c2be0921f23c9f7f864227e38dfc
font_02_sfnt_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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