Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e1e892de96caee…

MALICIOUS

PDF

73.9 KB Created: 2021-09-02 10:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44809de372776cb40240fb67dedc2766 SHA-1: d5a5c1e1b37dd8438bcc5fea40fc582c4dec6f97 SHA-256: 11e1e892de96caee3721ea0e5541a1c1eb2c0c6abd3005656e9a156629c55110
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://crewmak.ru/uplcv?utm_term=20+down+payment+on+300+000+house PDF link annotation
    • https://deltagroup.bg/uploads/file/jeginonakaxegixetimajam.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/3556239515.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/tubarebefojobifan.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/23cdba46b1859c8fc82718e87a50559f/68956768053.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607149ebafc9d---21583295517.pdfIn PDF document text
    • https://electroagro.es/pub/files/pakitilibe.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/faxesusiditemutowinof.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eead59c61---bopofuwazagaj.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85ae97201---zozibenerileraso.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/52932104657.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/xezixunozekixozefome.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021542232483551.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/funuxojeziwitek.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/71840608220.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/d93a44abdfc46bbde5adf093a7e7f211/subugufatawepixojenovefax.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/57615593384.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ncv5kknncg0nqitspvk04fu7vn/pexalagezizibutupijiwazaw.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/82148057631.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/aee8301d1240280442fef8b4cd3e36e8/jaladupuwadiwuditonutowo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9836eeba94d8ee8fd2f056f0444fdb75/14051458476.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e644cc107c0---63472246349.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed158e26fe---lopagod.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd7254196---88629794591.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lpjiln8o4v8ps6iikoesofi4do/49033654018.pdfIn PDF document text
    • https://27061010.com/uploads/files/202108270803229998.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/7648189317.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/29103961995.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3nu66qjbep3n3o1v6bdmcfjvve/gotosivudajibuk.pdfIn PDF document text
    • 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_off0000c1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F0 11036 bytes
SHA-256: 25005f70cca2f32a7a70007e09ddb26bea10d81f55b320013d93fdd3706779bb
font_01_sfnt_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 14952 bytes
SHA-256: 6810dc79c736b28cf9008a57b8d68914c3a21eaab8d6ba2bab3e8f7b65bbedf3
font_02_sfnt_off000100ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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