Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b8ec7c31c5faff…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 06:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5077f5d1c2d28681f2d29149f9f1a783 SHA-1: 43299565690e687ef4cca069922ae2cafa25e806 SHA-256: b1b8ec7c31c5faff40213fa7aa2094c3d6bb7ccbb96ae2429b6a2748d209655e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised WordPress sites or disposable hosting. These links likely serve as lures for phishing or scam operations, aiming to redirect users to malicious content.

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://spodne-pradlo-2bpoint.sk/UserFiles/File/68504940531.pdf In PDF document text
    • https://edusfera.pl/upload/file/pupizojojem.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/39130783110.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142acacc4416---lasawolaginazasozi.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/likobo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161394402222e2---24661365537.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/91137698116.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-3/20210903035248421020.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/39619480831.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/47189104743.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/23699765075.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/ximetulolimirubugazijomo.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/rijekorepot.pdfIn PDF document text
    • http://lawngo.net/fckfiles/pivekilid.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/magusenuwo.pdfIn PDF document text
    • http://rayer.cn/d/files/nabomapelumarawodu.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/81084965202.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/maxebufivuwejoteda.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/k90jptl583gkt6qkhso9ib7lj7/xonolegevamikuvubi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac798e439a---kuzufedatujobubopovonomu.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/jewalosojet.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/rixonenejitigejojosekefu.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/jazuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bergey%27s+manual+of+determinative+bacteriology+pdfPDF 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_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 11468 bytes
SHA-256: 7a66cc96921ee559f0496341716a604a3fe1099b151c0bd50b2965c93ee2a6ae
font_02_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 17728 bytes
SHA-256: 110584f39f09538d82c0aad3115a98c3a0c65e136859502ef69c0a8ba973769d

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