Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c4d6518bb85599…

MALICIOUS

PDF

90.4 KB Created: 2021-06-29 09:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29c91c19da7447f7e0cc118e982450a1 SHA-1: 51c3a1e91b707247647ff6131aa518d038ce1f76 SHA-256: 43c4d6518bb855995a2442d82321d7ecdd7c8a191d667ddfd581fda68a666c7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and appear to be part of a link farm. The SE_CALLBACK_LURE heuristic indicates the document is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/3871072024d7985a98e619beaeb83df5/22981824903.pdf In PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ftskm9j1d9g8a6572n5g3bjrh2/78026310727.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc7c8858a0---79924057146.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c101c1bac10---28366797937.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/tiwizebizamuzerajovafonur.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d245ddae0b969748f969e06c6ce89251/japuz.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qu44at5mj5cjcl5fjf5qjfvqaq/dodemazabasebinizuzuj.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/6d4fcf54fd3953f49fb3fe7452480545/67401077756.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a59c322d87cf99c553175c559d5e70e5/tijunegofonuman.pdfIn PDF document text
    • https://schmitz.cz/res/file/suwogepesowesa.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/1860381176.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/vepewokivirovifozefegoto.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/r240g640gvnmvlvg4d88ov54ts/38539198320.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9b4801c9c8724673495acd799f54e43b/67323431860.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075982d9630e---61158740601.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/1363284010.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754d6aa59b3---megogalisugutebugu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4fd9d49b---kakovozobikizuwusajup.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/27260bf7615444f2bc3ed49f914666f1/sebojop.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/letuke.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/39277720425.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210619_142055.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/taligadevutanim.pdfIn PDF document text
    • https://fallsplat.se/file/kiten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=licensed+clinical+professional+counselorPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001005e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 16680 bytes
SHA-256: 97f43fe20a3f508c9867904536c4b611b0f8de545631cf778e2d81c833beb313
font_01_sfnt_off00012bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14412 10572 bytes
SHA-256: b0f478296c0f9ac0f46920272c19f38ca7d3ef6a29d797d8a5b90f250c2e040e

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