Malicious PDF — malware analysis report

Static analysis result for SHA-256 a561867bdba8e327…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 15:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2bf47d79c6de04d07cea73c141c907b6 SHA-1: 43efc02be5b6494edbc4fc05223e3f16f184c24e SHA-256: a561867bdba8e32764bbd52c96724aa655cf999300a83cec247652051c3965e6
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to obscure the true malicious destination. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were directly extracted, the ML classifier strongly flagged the PDF as malicious, and the presence of embedded URLs supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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 http://ilovestory.com/upload/file/situtareboditonogik.pdf In PDF document text
    • http://husplaza.hu/editor_up/87522899827.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/vunikezoxajewak.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/baf26293ac8e60dbd3ba7344d36a8d47/dobizutoxujeduzewaguvufo.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/wulinudatatebaba.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/podorilixudekolajidesa.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/8154685562.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/86006327290.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613847c395546---29169750769.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/58685232359.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/wimilasezeliwotabevukurux.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/3547561435.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/kukovukazesiku.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bba86f12115dc9561439799cfb0881a9/74907615214.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/92774892785.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/94536348890.pdfIn PDF document text
    • http://haki.vn/uploads/files/16788109078.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/11346815416.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/74329143955.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210916090129.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/xujopusifurebosi.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/vamugeridus.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/wixejiwukoluwutiz.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/zaxagabatigeputinura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=turn+off+spam+filter+androidPDF 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_off0000d48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 18272 bytes
SHA-256: c82b971d263e9b1e1da699723f46207e194b659ac21268585261c5eaa20a3ebe
font_01_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 10720 bytes
SHA-256: c9cd1b20f507738d8df98032afe7b7599dbc4628d4dd025f6a1c259e0da7e864

Open this report in the interactive analyzer, or submit your own file for analysis.