Malicious PDF — malware analysis report

Static analysis result for SHA-256 d523b2d91eb658fe…

MALICIOUS

PDF

88.8 KB Created: 2021-08-03 16:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 4589012cc3456e6cc2b5e418f183891c SHA-1: ad5b803d4d4f464206cb7a31f98d595ae03d5827 SHA-256: d523b2d91eb658fe30d07fd3fd0d2ad3b3c89f2885b650eca77051ff5ed62c71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba8e17e793---10078262647.pdf In PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b346f10c9---mivikikusetadenizumonod.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/49311170241.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/luwotinokijekumigumepaj.pdfIn PDF document text
    • http://jarosi.hu/files/file/46668949202.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/99611222846.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/82958700736.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a07542fef74e6f92506bea69e51dd218/8593757214.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/34712120443.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d079817321---73604111152.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/45564360102.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/bojibuluberumer.pdfIn PDF document text
    • https://susta.vn/userfiles/file/61985120729.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609887e915aa1---49996934701.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607774fd80775---wakuperatobekuxof.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210704_165836.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/v47034pi6mah777dr6fuqtuls2/61012000615.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/71850481928.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/30d575df9b21508f88c0971a0d77df9d/lomonimujevinodilulaw.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b7e0bc493---kusobolekogojubaminabi.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/24775739304.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4eda282ea159d8c120291c09156753f6/66000278305.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/xivapofin.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/945ec518b1a0749e6524126f4e446b09/9396088167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+fix+underground+pet+fencePDF 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_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 10696 bytes
SHA-256: a17a97b9fe92e087a25bdf3aaff5b5aca5feb3c8a532b06d063b848c82cda9c9
font_01_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_02_sfnt_off00010db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB1 17948 bytes
SHA-256: 99348a58578f9cc760e2eec7875866eb2d7a514214b798ca36bf99e494a9bcda
font_03_sfnt_off00013ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1