Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c415de974924ec8…

MALICIOUS

PDF

80.3 KB Created: 2021-08-03 13:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 08e1a5cebd8e7901d6c5991b95255732 SHA-1: 131a37654adf3d3279f7d5e5e56a9620ecbfa0a6 SHA-256: 4c415de974924ec8e188925146e10f749c23e959fb5e49d1d8f2ec39eb4df9d1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://vswet.ru/f/7256162895.pdf In PDF document text
    • http://notarbrazda.cz/userfiles/file/pisegepak.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/70fbe38711ed347fcc5969230243848c/89287684053.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/44264932999.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/48123b1769a0ea9648fbe61f5bbdd6d7/40629463396.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/zitugazure.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/29550317618.pdfIn PDF document text
    • https://telorgabus.com/contents//files/lipizuduvodagun.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13877bb33f---25536225818.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/napanatipukeve.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/97102647486.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/98168837603.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fba54ba882a---30305933245.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/6048872103.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/45109538926.pdfIn PDF document text
    • http://atek-ent.com/upload/file/baxebidusufumozofoxisagu.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/81093200339.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///puzomurikijirus.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607352575a04c---fikasulanofamiw.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/72c06c0e843cb13844311e3636825266/17533366663.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/mawen.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf766eb4510---19924715724.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210522044210381109525.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/accd2e45ae24f846c49378b9ec8141ec/13574945671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=crazy+rich+asians+free+streamingPDF 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
font_00_sfnt_off0000c1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A4 16504 bytes
SHA-256: 3c6e2eaacc3b2f54a199e752fb2e2f2c3e7b791be0aecb16d8a120fa930488ea
font_01_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 6200 bytes
SHA-256: 4e1e3e89e1bb171abd25fd527413a0f6f9977a1b428f6e47303087031210e026
font_03_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 10820 bytes
SHA-256: 1b6896816b4731309f6cf755d765689d60a55211139176bf8cb71fe9add0732d

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