Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8acb559e9999412…

MALICIOUS

PDF

108.7 KB Created: 2021-07-19 11:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ff1e2ca66b84a3f82c703f0f11ed6e6b SHA-1: caeeec1d6a40c117da429a211992c9b6768c1733 SHA-256: b8acb559e99994120ef88b7a1c3800c79165e1d89a4fdfea4d428959d2dc8b30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082d859470ae---relojikiwelojezataboxoso.pdf In PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791c43c808b---fozidojorugalulu.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608757bd325f8---41135931858.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/c54fa798b2b38d0aa03d4b78e08c9cfa/kurubibefesa.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c644eac485---vemun.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/sodutunobiji.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d76d11e27---wufugowupikuzu.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cd35be9050ef502da1caa3dbff14d9bb/24426073761.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/subunidixuled.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928b5fc3e0a---7810036953.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/52848759393.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/66966201231.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/odflm2rda4mpjq6cio7frudhup/15489734986.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/875p7r84g9kf33ffafco7ulgn2/68277295328.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/53074530314.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/e1f57f81a5823cb90ca763541c385db1/8099569651.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/77732574834.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca41c1e4af---18299211104.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/90e7da9a6cdf5c61d101e7b82d5fffcc/43698313595.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/51j41isf5cbjlclhf48j1kdras/sivuviletogutobu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/42565959a0c3fee08d0f7ccbbaa59606/jedelidebodekanuja.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7866a7d54---88645998275.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac832640fe3---fawopeladuk.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e465796e0---12386736975.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/5977571584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=microelectronics+circuit+analysis+and+design+solutionsPDF 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_off00012cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD0 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
font_01_sfnt_off00014268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14268 10752 bytes
SHA-256: 2655885cb186a714c95c91c1d7d3120317988a338cf8b96af48ce575655b7532
font_02_sfnt_off00015b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B19 18368 bytes
SHA-256: e2fe6796b091959a1f275355249fc040c8f1e29c4cd26456a317bca846fbaffb
font_03_sfnt_off00018c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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