Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aed3d4bf8302c9d…

MALICIOUS

PDF

90.4 KB Created: 2021-06-30 03:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ae74dc27e1923ef2bfce7c10841c9b67 SHA-1: c7254febc7c58b8534b09a203137c939e6c52f7c SHA-256: 4aed3d4bf8302c9dd228750194f2b33e448811e0f7bf8ec1bcf0bfcb4f0179dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These sites, in turn, host other PDF files, suggesting a multi-stage attack designed to distribute malicious content or conduct phishing operations. The presence of multiple distinct hosts and the use of formcraft plugin uploads indicate a coordinated effort to obscure the true origin and destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7c10a6a82---2507307219.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e69bcbec64---29198497960.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9907634d0---26281561889.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/rk709b6s70qohh08c3anhqb8hp/18220774317.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608676f394f7f---fusarizafonus.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbee6c5dd4---7418021587.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/88815235882.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210618131900.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/f061grb1mfhjtu7ka0gtasfpup/nuwilejoximakokata.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078117ef2b25---pamokiwiwifuja.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/12501179493.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/xigimukukeli.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc475f7cc60---48930521358.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/160505838060a74dc46d15b.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1b16de573---majibujidabujuzekogama.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/50p44srb8tccg31okq0rm0la55/buvevaxeno.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8414a695d---sotixof.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/7465007956.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0v8virhqfmp1pako16fhntn140/14251180797.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47ac523656---xuserevonotutiwodogeposup.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3c60bkkr8usghou5e6fdalrhh/xidanel.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/megapobizibilitude.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5a82a847---sugafifefukeparub.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083797e37a07---bafevig.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e20c124cc8636642f258ad17d0c2acd/50629343939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=8+ball+pool+guideline+tool+iosPDF 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_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D0 17720 bytes
SHA-256: 0729535cce1f8388c4925c60f7cf04dad8fa12691e295bbda5ea76e92b2790d2
font_03_sfnt_off00014314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14314 10820 bytes
SHA-256: 58ee99744dd44491bd4366f0e27b6f4850eeaa63f27729c000346e9fb65e1571

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