Malicious PDF — malware analysis report

Static analysis result for SHA-256 501a46150d59b677…

MALICIOUS

PDF

86.5 KB Created: 2021-08-19 03:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4ad3a47a055711c32a9ca221194e853a SHA-1: a7590e8dfdd22018670a7fd07e0221a78776c60b SHA-256: 501a46150d59b677fd7f5364bfa06f144aad03de05f810ab1e8b7da6b1a69c5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ukonlinedirect.com/userfiles/files/34323978096.pdf In PDF document text
    • http://ha-sine.com/d/files/3067160245.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/nobebenuroludonil.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/76500264629.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bdd081e643cd6b70fe7dd32e6879afe9/rubisuwasevajililejobeka.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e623297c493---fuzekixomaralud.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd6dcdfefc---melave.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb01358946---63633549128.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbdc98d253---sesizulijokajenez.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda4ba2896---palifi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f9dfaea13---debenemipil.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///vunagojidoduxezobomik.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ng6bsue065tjabr596k7i7o41f/sesajasulokixipe.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/pufugila.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/da3965dd000c954069d62afe125c2d2c/pejefukesi.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/41446219475.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/lupovejafifixatogifag.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a126dd0dadf---mezuzususifiluko.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bd60d1a3d3c---kutigesibiruzog.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f39e3d459---futiferote.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/2a9abd9195820a58f697b902fa03cd18/latubagumojakugukig.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/rikizo.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/foveve.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/korokupuzalutejeravofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+adjust+5hp+tecumseh+carbPDF 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_off0000ebe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 17428 bytes
SHA-256: f1be249a06327ac902e8cd7caf8e409a12960fdb588a5f38589f584ce704504b
font_02_sfnt_off000131e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E9 11116 bytes
SHA-256: ba3be34858aa3ea86b96c37118ba06bdba654cbf88faf615403a390b8a2c5a03

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