Malicious PDF — malware analysis report

Static analysis result for SHA-256 760c4d3ee7bbf08f…

MALICIOUS

PDF

87.9 KB Created: 2021-08-04 03:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55cb55a2a80263d94558220d10aea9e2 SHA-1: e138d6ed56c84f93fdc097344198a15a61dd1372 SHA-256: 760c4d3ee7bbf08fafde78b50f0d5438a468f31b33775c931c73620e7000e915
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites and domains that appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/42499a98f1d59675f1e6a938223eaa3b/piwugojinola.pdf In PDF document text
    • http://dajuicebarus.com/uploads/files/wijibi.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/kozowakomupagubanivapawef.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fd4fa84223afc98deaffc607b6d62706/56678775973.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/dererijisera.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/87390339877.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/30458248406.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/bipugikudubivudunuderuzo.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/jojasog.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/05f296c2058f7fedd316490800eb0c4a/12879529521.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/14819027219.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/megalazuwad.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/virewon.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/45232569663.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/cbed6d181e80d604e929c55a264a129d/70693713244.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/losemutoregejijuwuli.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608257ca536ae---tivaselisegu.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/82267803668.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/simulegetipupejevewojuras.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b7378c0f---66115709595.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6d4dd848c---gemuperegogoruretajuzowaj.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/linotanivalefarajibero.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6ea209939a7805a43d0cbbaa597a844d/65337026097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=adverb+exercises+with+answers+for+grade+5PDF 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_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 11216 bytes
SHA-256: e7ce4fe7d3af8a30e183dcefab6493c3b9dd2d1d2b8d72094330b7f0d4f9074d
font_02_sfnt_off00012659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12659 17032 bytes
SHA-256: 7cc5bbe61614c9c1270a779335eeb26484f3a39a03dc76c32b8e20eaee2129b0

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