Malicious PDF — malware analysis report

Static analysis result for SHA-256 2533100c8ae5eaf7…

MALICIOUS

PDF

89.3 KB Created: 2021-09-08 03:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b3db3966c5cbc403a96884ffb32c718c SHA-1: e9dbef9fe87fb2e81d9bb43564a789de84617c47 SHA-256: 2533100c8ae5eaf70f1c2a49a893b12f9a0c02c053abe3e8b3f2ff1759e6774b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=2008+jeep+patriot+manual+transmission+fluid+type PDF link annotation
    • http://greece-ex.com/images/blog//file/kafujuzorikumonu.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/57161717495.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/99472938874.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/77846878074.pdfIn PDF document text
    • http://sun-eko.eu/files/file/65749546476.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d314613742a---58070004112.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c111e1518d20e2f884012e106c33c8f3/zozejadoluvo.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210622_AF48F82C768872F2.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c892915f39---misemebegerisadegi.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/gasetapibazesova.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/mebamikitubazawopo.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/39614136706.pdfIn PDF document text
    • https://wagaskar.com/media/70722848634.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/kmea5pv655ssfui2hl0uujc5ia/75076635835.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/76371224372.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/zulifaruv.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/315ec4c26be67dbb17ac0d7c79d2fbd0/38217902055.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5f5b382a3---85341517856.pdfIn PDF document text
    • https://ahha.az/userfiles/file/53509748128.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/jegikigarigil.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/xajamukavumipowixu.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e40eb2d7---vigoxososawedova.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/55579940348.pdfIn PDF document text
    • http://gojjang.com/uploads/files/nepomusowawekupakipu.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_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 18192 bytes
SHA-256: 311a1e6dcbd1e069871ae9788f2b67a39aa9264a4e216b827b77e348cf29f338
font_01_sfnt_off0001240a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240A 11356 bytes
SHA-256: 7b21fda63f28f7ff01bc952341d64873dc1b1d55578cfebd503355c95f4ebb2f
font_02_sfnt_off00013ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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