Malicious PDF — malware analysis report

Static analysis result for SHA-256 625f09dcb48924a0…

MALICIOUS

PDF

89.1 KB Created: 2021-07-13 02:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 80337111a3aeefa0827e0bf222d5bef6 SHA-1: 6fa90bb9ebee859d5cacb955267cdb1aba1ef322 SHA-256: 625f09dcb48924a02c964ff5a028d4aeab9d80656e6b98ec5f32b5e3149ce28e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://queure.ru/uplcv?utm_term=how+to+tell+if+ordered+pairs+are+linear PDF link annotation
    • http://erdivigado.hu/userkepek/file/lebovoxexavavarur.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/loruweleleref.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/66162294027.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/joxidapogivojotu.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/nolipelegesekipaxemigufu.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/242aae558d972bbdbbcc357e92b3a2ac/sevogumalapiterezexo.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/josepemogenafufivot.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083dac0c604d---mugedokixixo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a206de7459f---3963088280.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/875d4890e87f382a8e374b3cc9bd4344/satefidukojipuxan.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507094115669753.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/24040633421.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b21af72c9e5---dugulepudavusaxaxarip.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/xajirej.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/jabujowapagibewimi.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/37908136264.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/58891610890.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/20745099896.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/32a04d4b006b48b3c8d3cd09afa21d13/94535383321.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/tuxunekabaw.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ae43ab23ff830d39c400faa11286599d/tumadijazeb.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/45656615708.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/43318350970.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79726766a6d768eea27c17fd1dc6258e/pagakatofan.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a477ddcc9---29977103911.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/7b9f978d4d83a885afada267f4f1bf9a/fufatubaruretow.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/88548999af991815ee3bd1bd0415e9b3/40540225341.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_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11063 10568 bytes
SHA-256: e43a4dcf120e4bb5507819233bbf708f32ba3f856b39403e88f803a915cb706a
font_02_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 17540 bytes
SHA-256: 4c440462af45c8180fdd894ef06c402ca4775d06f53c479aec968f41af006c97

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