Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a90631dc68c69d9…

MALICIOUS

PDF

89.5 KB Created: 2021-07-30 17:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e275ddf6f47f13bd87f5829fc2089a2b SHA-1: aa72093f1aedfe0f812f4e6f22812714280654b3 SHA-256: 1a90631dc68c69d9f86e9e8550d81624a8ae4e7905849e96beedb87b8fc37891
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1055.012 Process Injection

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and a link farm heuristic indicates a strong intent to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://jxloanchien.com/style/postimage/file/gevobefonafamiruvofupugi.pdf In PDF document text
    • http://abwplazaview.com/uploads/files/62570576651.pdfIn PDF document text
    • https://taperagi.com/contents//files/ninorupekamapavifu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160834765ea4f9---30904531363.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/vulaponab.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/26622835301.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0c886c79ec38a42447354b48b83667f8/69112217300.pdfIn PDF document text
    • https://kristinanamaste.eu/files/lowabuduxasasobivilominem.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/3878012924.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/99776852327.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f036bdf1---molumegiguj.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/riruwexafemowoli.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/kexunovinaxumejaselop.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f725e2f2ee079819812df8e97755f6e7/25180978498.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/17008635586.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/49b8a0ccb4ec446d1047b55719fa8690/zabiraxote.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/525b38657316af2309a3341f6aa29761/jakidorofufizaparuda.pdfIn PDF document text
    • https://reniuved.it/file/98405709595.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/93632797151.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2fdcab3e33c9ad7705967d04363964f8/pavatutibobapipezo.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/10439473200.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/292fbea45473fc546e15416539112b6c/94170254619.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/aea321828681c48ee41f06acb75c211d/18401824127.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/98283118326.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072304c7e974---vudovilub.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/jidejaloge.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160802e64c33dd---razogekikekewenun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ldc+2020+model+question+paper+pdfPDF 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_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 16776 bytes
SHA-256: d79417cdbfbe74852ae2b871f72e64abcc034bca5fdce02316aa1c043c3f129b
font_01_sfnt_off00012496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAD 11224 bytes
SHA-256: 820e66087c8ebb9a087ea449bedc204cf7260cb0a94f41221bef4e09a2f3a214

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