Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c434b10caf78b8…

MALICIOUS

PDF

87.8 KB Created: 2021-09-06 19:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4741051a0b65eb2234782fad8d62e78f SHA-1: 7bbe9405799968a23f9fc478e4007593077ef6df SHA-256: 35c434b10caf78b82440d98caca5a679f28df50999428b181e02e6a2f4db23e9
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 exploiting PDF vulnerabilities or delivering malicious content. It also contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/b649d2763c2d3c197aab6a84a6c9fda1/69831022686.pdf In PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210904_367664E39E53AD04.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/nimazojepoda.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e929e36f5bf---98806978778.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/wurumefujewudujiv.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868ef4c0b38---kebonaboguvepeke.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/69908964817.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f219927328---8349760804.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d62882dcc95d5c0725c9e911be40901c/jubewoponafaro.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/sozugumulumuzedesuzerem.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/69551816916.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/19264156416.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fob9d6ja8aocmcnbvttiveipsa/19434422034.pdfIn PDF document text
    • https://shopabrang.com/images/files/9398359686.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/91382357619.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/fudazesagewigulodo.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/44550160086.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/49102244354.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/tetus.pdfIn PDF document text
    • http://omgdoctors.com/php/billboard/uploads/file/12220801937.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/nowidazodigejozatotakogi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b939b825dd---xilep.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/37b279e9ba00543e76825aa932d3d920/32855026149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=worksheet+works+long+divisionPDF 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_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 10600 bytes
SHA-256: 3e08a8ce429036a3dc43d1b2efd909ab86fd470ea7a74be66fdbd85cfdcb63c4
font_01_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 18984 bytes
SHA-256: 432c5f6409e5416807f1fe93155362e9e0abef754646363e33fabaeec93a9e5b
font_02_sfnt_off000139cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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