Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c22e3ee1c8f86e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 11:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 41b33121c38412c928ec44abed63496e SHA-1: c983d79db2403051eaaa2791aff7464ad36f632a SHA-256: 38c22e3ee1c8f86ee2a16ef7c07d4536e5599a67bdeb4ab1b961ac4647ff918c
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 a link farm pointing to multiple URLs hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of embedded JavaScript (T1059.007) and the nature of the links strongly suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/18db69cd9779f533629989eac96621ce/tafogijojap.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/10c20af53ae4a9cbdaf193b095fea995/nerofavarurotewu.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/6251834811.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab46fc6ba88---dowobelifutukasa.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/pifawaxizeremifonufet.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160920182f2569---gizadibuvapilatutidigepip.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/qorqfk4hh80evmvgf2rds7ne3d/25590080782.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/bipojotatepefe.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072190386986---23432159540.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/36dfe7c6aae543caeb7a85923c860c14/borejivuk.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/tuzotifavowalalojuj.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/9e3a81eca2fa12e0ff013bb19f0bf45c/mupumexatuwugifesovoz.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/fukomanisesotozomulam.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/95636787331.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5c1409d98254ea007aaa73d06d722ef6/22702609808.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/24046441419.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/930674193.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608362f4c385f---31454728735.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/73360914869.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/86164240766.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/gimixinedasa.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/97851757725.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/35092633967.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/33766026142.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba20cb0bc68---remowejozusuvikafe.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/37368614245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cochran+boiler+working+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_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 16424 bytes
SHA-256: e040e966e9014e3b3c5748c9748419bb6365abd27d4ca137bc83f1bcaaa69209
font_01_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 10980 bytes
SHA-256: 5e02a2f23ffd676be2183b9a4f860ed6defbf04a30b898586ad04340f0f3ff75

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