Malicious PDF — malware analysis report

Static analysis result for SHA-256 8865b03ef426f3f1…

MALICIOUS

PDF

84.6 KB Created: 2021-07-13 23:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e7e2fd37acb0d217758d712dbe83f28 SHA-1: 487abdd538df3d45015a18fd685ad68d37466bb6 SHA-256: 8865b03ef426f3f1bb63bff114ca2659ea364e05828e8c4ff738415382497bd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://lensprovn.com/ckfinder/userfiles/files/14396248099.pdf In PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607685fd5166b---munavuwowa.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/jo4b05jrk8ekb6pcs0atsd7gjr/kuvoja.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e24f49413bcc53c0cf7bd0edc1924240/suludimododapitazu.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/56819894041.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b969c62c3---buninaxo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a9d206c4---jujavanevuvubazosisonel.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1eb2cf6824e65e80f7c7cba87ad5c0cd/35304785849.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/86444691940.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75f12f1cd54776d07c01d63da386698f/78379347083.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/dikizukunuvatujebekasizuf.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/31g8i8oompommvqevs6vogsek4/12384487797.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/vuzorisetosexodoxorel.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/cad664a52a9fb5d82c90f2dabf5d3f32/ruwotunowi.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/kgu7acvg1ch0m968i19lrieu31/jujanibupotitajajimiboni.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/5241399576.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210610_D50137446358F766.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81066622f---57042057854.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/qqkiv1mcnab8tvs0j7d73ebb4v/88036781312.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5902e68632---mapuvuloveda.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/vbi17dch75ago1cotnt6mi2ql3/seradodi.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b562cd7c47---45445039452.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/sagupusirivetadik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+7th+grade+math+test+quiz+answersPDF 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_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 17696 bytes
SHA-256: 3c240200f4bf9628ad32db16a8373894a19529f07ebfb8e35f482a29b8dad68f
font_02_sfnt_off00012c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C82 10932 bytes
SHA-256: d47133a12eec2edd776bc76261b0255437421458d025229315959267ea10b5ef

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