Malicious PDF — malware analysis report

Static analysis result for SHA-256 3144614fb594dae7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 20:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f399ec944bdc25f0b2de3a922bb57a04 SHA-1: 22eac3df5ca7037bd5756612b9f008b28415793a SHA-256: 3144614fb594dae703cde59440beed3e199a91b0ff8a640e602c09e3dfe3db9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of multiple link farm URLs, some pointing to compromised WordPress sites, further indicates a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4a4255696f4bbfbef0c2a642ed7c4e1b/43463840954.pdf In PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/42766594006.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/lazigeliv.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/29014007849.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/32599720341.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871e39ea0e9---76868857423.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5991870ada---20618200161.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/fogulupuxisaxarutere.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/bodexezozigijaniv.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/zokejakeguxenokolawe.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bb68cf47b---60472655303.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e088bc2c97cf19c7e7e18a2f5bf7178a/6005667007.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/93430185607.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/1eaf6ed18097abf2b9ad38a90ca60536/vofawadixevoramudato.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/iscuigsv4oq71onokpcsft3kl2/nexonaraninobax.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/vazarosaposejuvojoriziwig.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/biwikumuliwefigiwadobe.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/66126304896.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/semoxefokata.pdfIn PDF document text
    • https://alutat.com/data/file/marodosuwiri.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/6fjs20s5evvlb36qghrm0jhi73/jegenes.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lulanozuzavukediv.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f52a75a906c86a4b27dee30a432ce437/10238511128.pdfIn PDF document text
    • http://sjhtractor.com/d/files/vediwefepafopamevazibot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=financial+reporting+pdf+calicut+universityPDF 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_off0000dae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 16124 bytes
SHA-256: 0287c0f51f64ceff620bcf7a325271fc576bab1031871b463c76a23fb9a5157e
font_01_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 11052 bytes
SHA-256: 5c50f662eab00205800311bd20a4d1b705c04501cb01d48d943642e9e61094a0
font_02_sfnt_off00011dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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