Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e2a0730b0fc89a…

MALICIOUS

PDF

97.1 KB Created: 2021-07-03 03:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 454536ec713f9b97b10303e5290369ec SHA-1: a3b91558f1ed6128965bb16b9bd2499f8b44b038 SHA-256: 81e2a0730b0fc89a84c20891438016dc40cd0551c64975002d8604c16b7ab014
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://allytemp.ru/uplcv?utm_term=verbal+linguistic+meaning+tagalog PDF link annotation
    • http://qlinairnv.be/userfiles/file/baderibajuzuwusodu.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/kozupukeguxidug.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/nemalil.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b877942f71---15391134318.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/fopaxewudunikin.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/71793066187.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f3146816ea22cb2b33ca0cb46787e66f/1377494262.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/sebosolizalen.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/32680730096.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943d658d813---pukexaberowaneli.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/20530236062.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/71909728574.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/oqfkujk8u4tbss3blg81n88ee4/puvokesoterifijalo.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/fijovufalejarumufavupobo.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/5172896603.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/tolanufimijijopelivum.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/27e97ae2b49b876c7cddb68b1e9e5e14/54704173989.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/41502275840.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af918fe8352---rukatovewapuxupawusojop.pdfIn PDF document text
    • http://schokobrunnen.com/idata/gumaderikil.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2954c233c56f5d3c3468d857e342f6d3/41877383168.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812becc6f36---sugemesaxomixo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0108e1bf28---ruvafomovejaze.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/42610fa12eb0977e5e3372e29fc69063/75386833472.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/xatotajexokisepulepodid.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/52649119092.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_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 14668 bytes
SHA-256: effeac413083864031939806dd0b790fe7bb4ee9a8bf8d0c35b76a3c2066a417
font_01_sfnt_off00011c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1C 16136 bytes
SHA-256: 43ba4516832389889addb3d2f8a8fc3ed68cc85e1bc690effc1738dd107fbaaf
font_02_sfnt_off00014598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14598 10780 bytes
SHA-256: 3facf40b1e7b4fc255d26d070b3216a531aa140acc8f9cb7c03a6609dc6f7dc9
font_03_sfnt_off00015e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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