Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cdcb3b47c3696d…

MALICIOUS

PDF

109.2 KB Created: 2021-06-27 11:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 47b35a7acb8e46f63776acb189e957da SHA-1: a5b63dabce6b263346a797ce502035896f0274c1 SHA-256: c3cdcb3b47c3696de116b6829ed410ec3a49b4cfd00a103e03ca4a0086134920
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. No scripts were extracted, but the embedded URLs suggest a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/50cdd4c929e64c4f7f20445c0d97bfd4/kasefotosuzexiguvabu.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/n9h15ie352d2u56j1ul96mmjjg/10352843463.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1f1a4c52b5732b45627f405e192438c8/67759630743.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/17458968285.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/77849360918.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/febae7e510a2b03a0a73913133ceb06f/zamubixerosa.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/kc5dmk21518brh2vb4q3i4hsfa/sepopemofefoveguzuxonudiw.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/7e3aab9955ee93e1c277ab312de801bd/xufigoroxul.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/zizetutetidijas.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/legaf.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/japobunaxowitalabux.pdfIn PDF document text
    • https://akvaguru.hu/user/file/37272593060.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/277e2aaa7347d9de5d8d664df23877b0/32531339798.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75a728b56a---golebik.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/fifunusapagi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2dfd6b658---94604183492.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160777e5c51cbc---wujudesugameno.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/nv8a5hljfo1t0o3ph385vihq9h/nesexoxirelevew.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9603ec50b---21005603903.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dc01e3de0---56385472614.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/48085824788.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896daaab807---tuwobir.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c5c650315188ad0d57860a4713f32bc5/2400462088.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d9f984542---kadivizaxawakesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=osrs+closest+furnace+to+bankPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FA 16208 bytes
SHA-256: 866592b48774e41f48693b2f16f882566d595128cdcec93df0de2b5068dafc2f
font_02_sfnt_off00015bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBA 10596 bytes
SHA-256: 0d33772fec3c6186752d5c95ae2755f2a3c6020592ffad1125ada3288fa5bdb7
font_03_sfnt_off00017424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17424 20524 bytes
SHA-256: 5a22123acdef5c90b7fde2ce8ae6e9d4c2be6698add7f6f731152ac30f721cd0

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