Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc762c1ee52e5d1…

MALICIOUS

PDF

88.0 KB Created: 2021-09-06 05:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1c0a485a9d6272f52f0d1c25cb1af88 SHA-1: 3b356f24142b7719a59946418f27daca58616b0e SHA-256: afc762c1ee52e5d1536d64d1eaabe006942eab4edd4bed830870f3f9796b8eb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6764fa51be44dfb2f58940d0ae4af07e/88051190511.pdf In PDF document text
    • https://tapuionoticias.com/ckfinder/files/jizumelaxixefexokenufadi.pdfIn PDF document text
    • http://huntland.hu/upload/file/28346389502.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076024ae730e---zemodipewudumewoxo.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/nazolerofona.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/u2ku7lqdacoo4skh8ro8pu2lt6/37691100458.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c1f5206c1---metesawaritexabarojaturu.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/90039091418.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/68291001078b7c2a83105dd10d85524c/xigeminem.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/80756535967.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/foxuwogabevuwodixifaxixo.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/48766538286.pdfIn PDF document text
    • http://normel.org/files/upload/file/luwejugisipipasadoradaz.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5323684593fa72345363c913b1a18cf7/wiworetemifosojofolapaboj.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dece1f392e---nikelubumikujifepamefiwaj.pdfIn PDF document text
    • https://biocoils.com/img/file/31183164638.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609347211dcb2---46283216409.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6744b7b817a27d227a69636092cea37/sapopeguliduwafen.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/bcc11c6eb406414af52c5bf6c11bf0cd/xomukewamoxuzuserawod.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/buxokaxuxelenogusinaromas.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/03e543d8fb42379f558ff164d1329e04/23914459142.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb69f18a4f8---99614979881.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/84485113818.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9db7f11a0a1d1b5f3072f955ee448c70/wemekavegavavifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=citizenship+vs+nationality+pdfPDF 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_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 17384 bytes
SHA-256: 6c699d12a26c3385861533f20b610c467fe47b7c9d0cb5e42938c8ee3d3f2f1a
font_01_sfnt_off00012169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12169 10768 bytes
SHA-256: c13859cc235adc95b042f4fc875c8c311b6bf5dbb8a60c9f14be05dcad5be984
font_02_sfnt_off00013a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1