Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a8cd1e99e93071…

MALICIOUS

PDF

84.5 KB Created: 2021-09-11 13:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ba0b78114fe363b322bff7a18a0fda7 SHA-1: eeef7853749aef53ecb8f79dc666d27141b81dcd SHA-256: 16a8cd1e99e930718340c63c9392bc8f53d2abfc722285069433222844ead9a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded JavaScript stream, though not fully analyzed, likely contributes to the malicious functionality by facilitating these redirects or further obfuscating the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://veterky.ru/ckfinder/userfiles/files/nevolezuviw.pdf In PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376945d9f73---67763751239.pdfIn PDF document text
    • http://juentai.com/userfiles/files/82626291936.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/20016304086.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/tefigedupoku.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613312c65da8b---pojufediwul.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/nufekaluxi.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/39787018908.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210911174802.pdfIn PDF document text
    • https://sentralperdana.com/file/34179665450.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/xoruzeritonasifefe.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/73295165047.pdfIn PDF document text
    • http://yoron.net/up/files/nuxamapumaxumusiwesozulu.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/fuwujifubagalakamegoneg.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/18637473621.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/8540997002.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0b53eb12---72704534667.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/lidegawino.pdfIn PDF document text
    • http://kunbot.com/upload/files/28547188956.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0a315d9bc---kodatipudotigazegagavi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02c24ccea---23585620404.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/15919045831.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/48892225196.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/vofapivimidu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd5c5d79a---sinejomasuwozuxesab.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109100415299659.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/bezuwaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+free+editing+software+windowsPDF 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_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 10620 bytes
SHA-256: e797f9fbc0dc53d744ca47694f380a0cc911e1b40c23f2eac9c29005310e14a6
font_01_sfnt_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 17928 bytes
SHA-256: 158e08d00787636d83abfc9dfc68ebab6067c99ef275ed0cbd16d29fe4177416
font_02_sfnt_off00012c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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