Malicious PDF — malware analysis report

Static analysis result for SHA-256 48016b8a1e2bb16e…

MALICIOUS

PDF

84.0 KB Created: 2021-06-29 07:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bb52d3d13dfbfd1be9ac1484a9ef51e9 SHA-1: 5ee496a4a01cef86fbbcee70a95e60ea8c43ff7d SHA-256: 48016b8a1e2bb16e956c4e38674bf96954eba63d7ee98bf1f06f268be838393a
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is described as a link farm pointing to compromised WordPress upload storage. This suggests the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=what+does+cip+stand+for PDF link annotation
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b037c8e3bb5---32857142365.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/83verk099me0dj2brkue39r140/zalik.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/resokegesuvapagop.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/gagiminiwanuked.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f316164348---xomagulinoredawigagut.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/sidekalalokugezapijufa.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/vatimowapoxupa.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/19072687846.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983ba28eb41---najagupepupeno.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da62b92f4af---gewexubid.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/85746817123.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/gagigitifawiwuselax.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e9515137f---nujuxuwixusovo.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/63309684941.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/vikibunofufizojen.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608305279fd99---zobarojovonize.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/2nc5c0952tbvlld5drrj2i6e33/vuvemafomiselana.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0a760d38a387b38b60fa18d974fb4c8d/patekebovexodojuz.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/4364276866.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/zofanuz.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7ecd182cf13fa4174e80406dd0e3d573/kelavi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4d498af91534643d04c4557717b17d60/91029097645.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/46980677138.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4392f6b3ea---zewexusufu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 10664 bytes
SHA-256: 39650ace1d4d83a69dccf007284ec9cff5989677057d822f12a380c4913515aa
font_01_sfnt_off0000fdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 17392 bytes
SHA-256: 0b6c891da20331fab53381b650b871d3f737c804da1745407af890b3f8f411d1
font_02_sfnt_off00012abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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