Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d39b25a385a30f9…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 16:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ca50de42cf4351b42c4c4f79b2d63bd SHA-1: 730abbc1e1fd4377078aeb4422ec79cd2d48894c SHA-256: 5d39b25a385a30f92a86c7e56de8f8e6e1ecbf0717561f6279a6ed7150f32632
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, designed to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://tasteofruraleurope.eu/upload/File/6225986947.pdf In PDF document text
    • https://damiel.eu/userfiles/file/33193920524.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3pfi3cpu4pjplkbb834qob0ti0/35543467146.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/50435915839.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/72665616554.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359d3be00ee---5006777581.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5501998105.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/7684037086.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/dibupaxizizudesedip.pdfIn PDF document text
    • https://oasis-travel.ro/files/50490329574.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/zigexabom.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/tuzixowaxubikemupus.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/polodawomivetoduzesumadun.pdfIn PDF document text
    • http://epmachine.ru/d/files/sorutu.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/38854047810.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/tavawufofafobarox.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/4399500483.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba5717517---noziravedelobodamebix.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/zoporadirafalanupefi.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/38517202560.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/nurami.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/jofolutuxojame.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/luwodedun.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/padizetixujad.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/5590034998.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0dec126d9---19321334470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+ringtones+malayalam+2020PDF 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_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 10860 bytes
SHA-256: 443163d68dc0c215db32fd79a125816a00f11646541cd348e53c9ed8c5fd068a
font_01_sfnt_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 16548 bytes
SHA-256: 2533d68a926d46434ee11d67970ab4a4f6bca7fec634a412f01c733c7936f678
font_02_sfnt_off00012aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1