Malicious PDF — malware analysis report

Static analysis result for SHA-256 2362aa8d3d659d01…

MALICIOUS

PDF

88.5 KB Created: 2021-07-02 12:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ab327a2753d50694f2138bb1316395c2 SHA-1: 70fb6c68bea2eb75b298e111f1b1d8a6b6f8247d SHA-256: 2362aa8d3d659d01a6411100abf4e1b7293a0f1207aeab15bfb5f2493ba6bd29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 external URIs and link farm patterns, indicating an attempt to redirect users to potentially malicious or phishing sites. The presence of embedded URLs and the overall structure suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://inwebjor.ru/uplcv?utm_term=how+to+cheat+in+brawl+stars PDF link annotation
    • http://cwesp.biz/upload/file/nelewefigixuvexalujojako.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/54488635896.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/vakurefikorobafini.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/089fc72ed7943c09c95337417e5b761b/repibudabanamebop.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/29483943294.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/vuzotubejamivo.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/20671740927.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/36c6a35673fa76b8ffa05a0cdf302d69/67163493031.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079b90725678---30663676394.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/21625535465.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jm0fodjsr2hbqr3okho9aml7ek/gokugesuwowijatovunapura.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c42faf332f4---14257887903.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d708d7ca35f---rojaxosupadike.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/45698574701.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeaf38924f---korakax.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/14606203140.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070ecb8c9be5---79190941480.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609415c7b885c---29325611412.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a788847732edb2e174859f3a7dece773/migegasaxosaki.pdfIn PDF document text
    • https://xistenze.com/files/files/mezamikegerew.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086afbcc9b0f---gezaxixubimufivonix.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_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 18996 bytes
SHA-256: fdb08b14109e704ff46a15e9057ed52f0f85b27350ba777455541b922994d4b2
font_01_sfnt_off000124d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEE 10544 bytes
SHA-256: 742fde39e0522cd8e7488fdee501ef24fe1fc64a30742a83883b3fc8aaaff5e4

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