Malicious PDF — malware analysis report

Static analysis result for SHA-256 23584686f00022a6…

MALICIOUS

PDF

87.2 KB Created: 2021-07-08 10:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aac29973f1365dac54f1772051c77315 SHA-1: d8b799e8d5d607c0ba65e37983b5833d39b79534 SHA-256: 23584686f00022a689bb60866e11f304f52bc62cce12b6d3803e42d4afe74566
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple compromised CMS upload locations, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=can+you+refreeze+turkey+bacon PDF link annotation
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecdba7aadb---poginogumizotu.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/99894694107.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/todebowajevatifaw.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f5afb647c2fd8abfb64aec5d75db855/74973558953.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdee5a25fde---lizelikegosojarawu.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607abaaae21bf---37663160322.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e0955412783d09f195a90ee4af89f2ef/32139186168.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/mefidukamekale.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/fenuwebaki.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/227901b801621dd4625ef18f62769a62/guxatukunuzoluxudazoratad.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ad2f8d31a3d81387a9cc6134ce2635a8/lekopagufuzozi.pdfIn PDF document text
    • http://planetamama.ru/files/file/wubowejiwana.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/256bbdce8794caf74ea924cd08974a19/869469974.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/bodeluno.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9cf4e1ce5---gebuwexatar.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/5758714656.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f57ef019---gasaxowidatowulikos.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/22630787665.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-25/20210525092007729063.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e118cbf084---11074120489.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/4076123066.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079174f9410f---kesorinuliketa.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/zizuxod.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/nlas4lmufee44u5clmm3sg3ek1/2487718231.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/23050219770.pdfIn PDF document text
    • 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_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 10560 bytes
SHA-256: f660bbbade502fa2326b621034e34ea5537a7716cafad886644026b8ad2ef276
font_01_sfnt_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 17184 bytes
SHA-256: 8ac2103a9842120268466d518a6d66768baf222d014276a6a5f0707cb4a82aae
font_02_sfnt_off00013756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1