Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd4a21204f0beff…

MALICIOUS

PDF

99.7 KB Created: 2021-07-06 15:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85191c0aecd941fee16a70451ff48e8c SHA-1: ae25dd4365f54afbbdc55c1a48dd954cd99ae283 SHA-256: 2fd4a21204f0beff0842a39ac1508273e72c31f3d03ebb3ebf15fb3efe50c174
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of using the document to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a46430d80a0---miguvitixerevob.pdf In PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/f743fe75f3eccc720a8d8a0f805c8a68/zudujuxeka.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/kilejutaxor.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/ranilobura.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/fn98k47o70bildnqfa7kqqqbmj/visavutukigelunuziriloguk.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/bl8jfd561f9phhk689iqd0d215/29436687044.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/dewubun.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/bunilip.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/13126095984.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/21302264735.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/38a387b2940648def53d2c5b43580b21/47509854916.pdfIn PDF document text
    • https://bliznacite.com/files/jusevujeredibivuw.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/53137058549.pdfIn PDF document text
    • http://amdind.com/userfiles/file/58377631942.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4a952a40---nubanejosulavovarewojufo.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e157788133211fe412cf290aa37aa83b/xirena.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca93bd55b7---8967068384.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/72pvftqtc3s93af1g4q5fa77li/87677641451.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ic83kk5pj4fh4ah9mnl0hc4dqb/weladugavorawekurozejox.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/34410811324.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608357352862d---nimoduvoxuwuzedub.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160986fdd47e79---97477012359.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/56684083067.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/wugabewisuzowuwumixikag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=electronic+devices+9th+editionPDF 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
stream_003_off00012698.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12698 25124 bytes
SHA-256: ea396b552abb8e3a0e0beec5dad347d36e595bb180b985e1d7e9e7c1604562e4
font_00_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 17016 bytes
SHA-256: 959df47b3d81b76486d8b23c0d12406b0c67951310ebee3103110ebf29941baa
font_02_sfnt_off00015120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16937 10524 bytes
SHA-256: 41c3b3125945013beb02e10b71676b53134a4daa1e0b920973c2769b5cf1f675

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