Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8474b4bc03e71a…

MALICIOUS

PDF

136.5 KB Created: 2021-08-02 19:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 653a8814b90e987e2508bd772b7726c5 SHA-1: 4bdc2a0df96a48960f8ce29d37a7706535670d38 SHA-256: 4a8474b4bc03e71ac597dedb95fd19ddbfef818411f6b5fc77a4175d1461c5c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://eortak.com/img/fck_temp/file/saxarunafixiz.pdf In PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/nepatipobegemerixe.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/4249151185.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/6cc426355c56b284cbdab23df04cb24a/91818110650.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/vuwoz.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/80fa7af7cb068103e1f4d257f21890da/xosidoka.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6e382dea22c1d03113afbaf26dcc849c/bijagisu.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/51950303758.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/76594624963.pdfIn PDF document text
    • http://mqskin.com/luutru/files/23309993246.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/xupudejo.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e427b8f15---98218886522.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/141jhog9o7arh602pqehv6u1bs/mubudij.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/afm7d0hndvra17k0jam2n2j1e3/58159534845.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/eikmbsiclir0c339r94jtpt2eb/relatavilisumif.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c23ba7c18f---83558144544.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ntj12oi1hstdbdj892urtu8vn3/tafupupak.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/munoxigoxelaku.pdfIn PDF document text
    • https://luminex.pl/upload/file/posudazevewomogomaja.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///baxidifakifuburube.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a40d7b02d06---tojiwazuwexidulodudotabop.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/83550976933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=taylor+electronic+scale+7517+batteryPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_01_sfnt_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 10676 bytes
SHA-256: fd20d2e2ac26f3b517db789ca790a45ac9e5220b6ff285082c83904dbd88c0bb
font_02_sfnt_off000103cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 77612 bytes
SHA-256: a559a781f1bb533e71a4ec746164fdc25b126aa656c4564c575e5d947ec794ad
font_03_sfnt_off0001cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E781 15784 bytes
SHA-256: 791e7c303171379d98534262334c7108c4dd1503d973057de19e00399512971c

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