Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16c38e666c758fc…

MALICIOUS

PDF

89.9 KB Created: 2021-08-17 11:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9370c48a23f01d3c5e9d41b8b8d466f SHA-1: 1d7a953aa8d569658f4be56bca2ae03b4294e0f2 SHA-256: b16c38e666c758fc2520d5d1a9441506ec06f7a139a2c3f10143232a0d82d4f6
116 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting. The presence of a 'Macro/content-enable lure' heuristic suggests the document is designed to trick the user into enabling content, which would likely lead to the execution of malicious code or the download of further payloads from the linked URLs. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://hitpoint.tw/userfiles/file/fimutizavaluginapilemetuk.pdf In PDF document text
    • https://conexkarvan.com/cache/fck_files/file/gosofi.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/5795d6698db63afa9f2740236e51ad24/28842740290.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/suvosare.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/muzexi.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/wotawudupazomoge.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160add20fb1fd1---dewafasowubi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/52744833a46f66c7427abfb96d9f76de/zevapugepelix.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943cc88b890---duzadesubufedagebefo.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/26943754762.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/49854522826.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/42ec8c8b877a5ba5c4a6407ed4d6e6a0/livotigutavanozekatilixor.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/63ab6f1a7e25700883ee0794fba05c0d/93765349285.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/gamexusas.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/22860965.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879fa656cb2---gapamegud.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161195d3dcd391---vokigonasexuzusukomamubum.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92484cab53---wajogoz.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097e85ee2248---gumilakosador.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/bupovozeviwusividorugob.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/86d2038d082b52db8b722577f6099c6a/53161390812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=why+is+radial+symmetry+advantageous+for+sedentary+animalsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808c62ce71a---lofiti.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 11076 bytes
SHA-256: 9eb95d02eb3a0a3f5634f85a563f0aaddebf8e9f34e5662635bf2f4f974c4602
font_01_sfnt_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 16728 bytes
SHA-256: 5135ac4521fb14c3299fb9591054ab270e205441b4c164165b0d616685536717
font_02_sfnt_off000129f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F0 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00013fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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