Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f6aef84d006e4e…

MALICIOUS

PDF

87.6 KB Created: 2021-09-15 05:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a41b0114057da2fa21af75031ac9abe2 SHA-1: bf1e6674d807c5bfa4e8ca1f139c70b13138ff14 SHA-256: f6f6aef84d006e4edf8bac3f53daf852931d6e1869f178e36f49a4dc5cd3a859
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a visual download button further supports this, aiming to trick users into clicking malicious links. While no scripts were directly extracted, the ML classifier strongly indicates malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+download+full+movie PDF link annotation
    • https://satuldelut.ro/ckfinder/userfiles/files/48464926627.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/81499646246.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/21076778565.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/tujodamixuvini.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/xipedafisum.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b662f22f4c---vejotorolisaminibutejidiw.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d8c38ac1226c2edce696c4229e64b06a/worisizipapidobewonidoma.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614141f371173---72681073303.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/79419571288.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/robubigefuvopovaka.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/wiviloxibadenaxuserave.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/4315547644.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161371b8b78597---1929346161.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/galatotiderurekazafi.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/97985270843.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/47945774289.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/92346162357.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613baee857cca---dakogetiwa.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614151f6db0e3---gituwotazelumidesus.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/rulorosakozenopodazo.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/58372358353.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d8ca4948e65038ac8044ddc32c3e834/temejalakutesirusafa.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/97956012138.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e53f96578---nudakurexikudofizepemut.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/gsbjk05k30opn52tg4omdehph4/2119966978.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_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 11156 bytes
SHA-256: 6931d4fafb77fe2211225625b973fa66456fe7c9170828d6b5c538e08c429874
font_01_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 19564 bytes
SHA-256: 5045242e62e7c08b5ae58ebf2dd64ce78adc2307aa37d3b780734577dba57ca2
font_02_sfnt_off0001385a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1