Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19d90dc4393b69a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 05:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b1e97ffd276c5114f6e49e5571c8fbc SHA-1: 60084c629c8138cbe8acef6862ca617c8ff288fa SHA-256: a19d90dc4393b69a0dda95b5f4dc6cd7c443b67a8b894b90c8c0f107c7f1b19f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised websites, likely to distribute a malicious payload disguised as a game download. The ML classifier strongly indicated maliciousness, and the presence of numerous links to potentially compromised CMS uploads supports this. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/762d91753d49540416bc0eff2e05d98e/petunel.pdf In PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a9209698908674ea81be3ed2cab30a4c/63911526782.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/7tl9u1tbp472c06ieiqbj7msv9/98970968748.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0ae0d66ae---warelonefukidafedepilez.pdfIn PDF document text
    • https://designclarf.it/file/93520831408.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/vetopixuzijuwaneletu.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/89662191744.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/ladejisu.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/25566262679.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a78a0b1a739b1d69b2fdb2a4a0045153/wujenegugasa.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/66798463813.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d46e224747---29931724550.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3fa2578016388593a2407e43d8e585f0/mavedobisizusis.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/dakafokawagegupediligow.pdfIn PDF document text
    • https://wagaskar.com/media/44518352331.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1289c99c42---80552422260.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/92273929316.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611fadf94c12e---neruz.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3c55ace6c96fb62510d94979884b1647/rizofuvuzugemutozu.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/99633277876.pdfIn PDF document text
    • http://flomojapan.com/upload/files/zeragafogewezatetewobig.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/84983929741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+purble+place+game+for+windows+10PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f3e68bb51335f9ede3753f1056879d04/80402473790.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_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 17492 bytes
SHA-256: 3b0b5e7b14304848594824811a976d2c7a9b5d44b52bb6c90f89ba89b4cca729
font_01_sfnt_off00010f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12768 11368 bytes
SHA-256: 636b9d47abb538b8be4693a48e6b76aeb7d3d29be76fc7ea622d512b99b7b1b6

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