Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f107fcebd665801…

MALICIOUS

PDF

93.1 KB Created: 2021-09-17 10:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0223a89fcd8202bcfb82b7547f5f073 SHA-1: db34d963d7727df402c89c2d65f04ea95e91770c SHA-256: 4f107fcebd665801e54973368b38f72917a7d6195a632a00895f568210a8ffd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points to a tactic of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://inwebjor.ru/uplcv?utm_term=how+to+make+collage+in+instagram+story+in+android PDF link annotation
    • http://pharmabiosolutions.com/filespath/files/20210910065355.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/luxeruxasoref.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614090eb81460---meruzirajogesewu.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/tonogewetuxezag.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/60226365352.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/70456607822.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/11764099906.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/tewimazales.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/wulitamap.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/nukis.pdfIn PDF document text
    • https://promise-land.com/upload/file/82077129745.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/38296861053.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/23fc3cf5a7f21947d01fefa0933dcb81/boregutobama.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/jewerevorixupe.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/80365784895.pdfIn PDF document text
    • http://leton.pl/userfiles/file/56320829623.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d4344372c4e27145752c2786133045b0/ninenepanawuxo.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5696aadbd9b5a1a825aa007b65c5a20e/satusufadokoweberi.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d91886c1972a7fa759fd298db71fbcd4/56817843443.pdfIn PDF document text
    • http://air-con.ru/upload/files/54127952650.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/23084900820.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/79179017647.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/81515249999.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/96726525801.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630705502.pdfIn PDF document text
    • https://12tiga.com/contents/files/37558951502.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/19389671284.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_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 10996 bytes
SHA-256: d0462294e54628f3cbd7a46c6a0463e480a948c3ce666604eff656d73abdc542
font_01_sfnt_off00011d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 18172 bytes
SHA-256: fe41b6f939ab12fd235ef369d123f1c5383a5916c298560bcede27f073e0d818
font_02_sfnt_off00014c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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