Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc6bd92ac9c18dd…

MALICIOUS

PDF

66.3 KB Created: 2021-06-21 04:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 20e9dc08fd0e1bea852e3e261b32205b SHA-1: c3a5bfe91a27e9d7238a94979c9494d8f14a8d52 SHA-256: ddc6bd92ac9c18dd58381638795d776858930588d734db373ef6d4eccfc36041
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 CMS upload directories, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple links to potentially compromised WordPress sites suggests a coordinated effort to distribute malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737e70c2709---pamazesavepo.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54cb05030b---wupasonibepilavetifuku.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d580b67a76---papawopumudokotumexirigi.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/71fbf16cb25da2245e04f2a62ecd8647/sufebezururuxura.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b346963bfcd---50851692530.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b69fee703dd---wazasofetaro.pdfIn PDF document text
    • https://loctra.net/userfiles/file/xavolaxuseropokibew.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/50pava9ml5h0pi5qap2v3994e0/61785995156.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0bc53675---23347639351.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a687ea4e5da---64624771237.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/525l6qdghbqi31q6mb2b6o4q1g/84582669111.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa6a135021---wuxerokanisu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/5ojis5erijifhs7p3o93r8tl35/sinezifibiw.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/zobazuvofafugiw.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962f4df005a---lakabafuvodonivejuk.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/jexad.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870d61ea5fc---41200757625.pdfIn PDF document text
    • http://ahchala.com/img/file/mupegobakozepogawobano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+sociology+book+big+ideas+simply+explained+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC439 5796 bytes
SHA-256: 1165388acf79df17bc76fb6befaa5ec09348b16bc635e1d98aa52d2f411b38db
font_01_sfnt_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 10620 bytes
SHA-256: b2554b6816a6437041cb9c23b5e16a06acd1ac858f6acd22d306503613e814f9

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