Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc331b0fe3a4a93…

MALICIOUS

PDF

117.3 KB Created: 2021-07-22 20:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f26439b13a428a4788f7316430b41acc SHA-1: 8625719d3c6be05d17f484654b6d4f6333958160 SHA-256: fdc331b0fe3a4a93e4a653946bda56885a00302ccb9418125bb3b45eaebc1de9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable domains. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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://infoenergie-loire.org/userfiles/file/3098273432.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9vjnr0omgelgks290o6mfb4if2/sodirepuki.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/75473007946.pdfIn PDF document text
    • https://jetaime-shop.com/files/pazapududefevinev.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/kb94rq6cldb7l8fvqlq55nf3ui/wifidudebudapo.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/51450539628.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c289a94ad73---54488121801.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/53275471229.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/wejinamesetus.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/33565387577.pdfIn PDF document text
    • http://dytac.hk/userfiles/4719805216.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/dc802b9573845a6a003f41f042d350eb/joxukizobewi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/h1duhe9hl0qp0p7r2abginc1bf/turunoteguja.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/njqmosbih9omshqa6qi7ancj9u/44932114637.pdfIn PDF document text
    • https://oksushidelivery.cl/sitio/public/files/file/83416183222.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051923155573499.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d488753fa40054c32cba6c9322000df4/wusejipakotesaba.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160768700012ed---58525135766.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-04-03-54-42-cMMaqZKi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a94a47b5a5---gijufegotalitaroxedoxevu.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/6057da38dd9ad30392677eb7c1aaafba/8224881442.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f3dd5d12c---bodujolevipiwu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e1198d788b4---pujetukisuzukotuxasizug.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/xupipu.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021722145588892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=humility+is+a+virtue+meaningPDF 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_off00015621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15621 18760 bytes
SHA-256: 4e19df6eb7a43076e9f624c4db5bcf3e8aec20b8f603cc0df4b4a235008ecc4c
font_01_sfnt_off00018621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18621 3368 bytes
SHA-256: 03b5ec9728c44c08d02f8d6ebb458ab8ec121ea11fd78ba3265d8859b1b2f0a2
font_02_sfnt_off00019390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001aba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABA7 10604 bytes
SHA-256: dc8a10c7fb6cc9ce39b6ae9d0950d74c69ae7b14e051645c0f42a58cf2a83183