Malicious PDF — malware analysis report

Static analysis result for SHA-256 4286f6216aee415c…

MALICIOUS

PDF

86.0 KB Created: 2021-08-13 14:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bea0623b08d2e0a13f5b963cd1fa244b SHA-1: 81f3e42a55631441267ed12d7681f8ff06f9c325 SHA-256: 4286f6216aee415cdc8807e9d3a114c6556b913eadd67601e17dbd54686c84e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to potentially malicious sites, possibly for SEO manipulation or to host further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a9ccb39325e98bca61afe4ddf8dac452/sixabuwovakip.pdf In PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/75532929083.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/12809aa84150e09f3cb19d485b28ce8b/65799849652.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/digobuni.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7g4aa9n726a377e9pb70p1upv1/53311005091.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/papilum.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/boboravanufuv.pdfIn PDF document text
    • https://atl-50.com/files/file/41496455432.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/816084422.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/bijukemuralorefobupidag.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d0ffcfcb3---35018401914.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e119327566c2e7e3576c05b523a0dbd6/18344737802.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/80oq6hujoml9bskj3e1gdspvd7/jesapuvelelezakerufize.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/larofazedumif.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/womujeduzera.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b2154b3b2c0e04e2045463900d141844/ridubodaxateseruwi.pdfIn PDF document text
    • http://rafaelokazakov.com/file/84879395868.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63246e554---41453384429.pdfIn PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/lanozedivijeludono.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b254b2ffb0---fikokevifiligaxakejol.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/gizenabilirupominuruxija.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/b6kinck1r3u5nmelbed8l44pmr/gulomodezexeguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cuanto+vale+la+ciudadaniaPDF 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_off0000eccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 17324 bytes
SHA-256: b9cc1a4cf2879aa6232bc2c10c80a34f5cde8b27444d0c1aa31b3ecc2065fbf3
font_01_sfnt_off000118e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F8 10292 bytes
SHA-256: 0126e51c0608ba6ace96600fe9f6cc4060bac4ccd8cb71fcf5d293539a7a7b20

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