Malicious PDF — malware analysis report

Static analysis result for SHA-256 33513d6d0f88f083…

MALICIOUS

PDF

75.6 KB Created: 2021-09-24 22:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2d305e52441fc7a3cf1d99fbf0c9681e SHA-1: 69685ac66c679c2a024633848f737af21e81046a SHA-256: 33513d6d0f88f08324451212df3b4d49b5c6810573e7116e152aa5d3fa58e6ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm that directs users to various URLs, some hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript, though not fully detailed, is a common vector for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cbdc.co/uploads/ckfinder/userfiles/files/94301538839.pdf In PDF document text
    • http://antoniolescio.net/userfiles/files/62302305459.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/govezapuwomubagavisazatez.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/93650143937.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/89968969525.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210922031918.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/62456152841.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d27f8326b84eafc83f395626fa41dac2/37819210017.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/bigatap.pdfIn PDF document text
    • http://gibisch.org/files/files/lotam.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5a23c489d---derezumeser.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/32503099646.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/63369062676.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/81394307160.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/gakufiwufoloruvosogoselop.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/41895813462.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/kobigusezonutixupejuzu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93a615668---1624798218.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/21498426706.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210922211349.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161393366a5df1---78811965739.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/25974669066.pdfIn PDF document text
    • http://sarafis.pl/img/userfiles/file/zifosavufidezakifemedego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+watch+mha+for+freePDF 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_off0000ba57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA57 20720 bytes
SHA-256: 774489badb8aa370a07eaa32d15afe061a966c74f3d014bbc7388558fdb85c55
font_01_sfnt_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 10268 bytes
SHA-256: 95b753019210a11e47bf7cc71bf94518025c2f56dcb2ead14db98db74b73601a

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