Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b05a700a4c2f96…

MALICIOUS

PDF

86.7 KB Created: 2021-06-29 23:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc93fc3e0f6313fb01ccb835bd2f32d8 SHA-1: 7e8bd076eaafe4def6a9efc9c3f6220ec77be136 SHA-256: 88b05a700a4c2f968a6344708ad1b214772522e936d9df058cff410d155c1d59
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://irlanc.ru/uplcv?utm_term=classic+500+stealth+black
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa406a112e6---35595767916.pdf
    • https://drsaman.com/files/kabominumaxukipo.pdf
    • http://bluecars.pl/userfiles/file/xupaxulogideboga.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/d239cl149f9srfk6l17a674k3a/mosusokupumexefi.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607efbe8b5c1d---viniradom.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab98db64ed8---9849138477.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7075e328b---givejevarujire.pdf
    • http://tokstar.com/_UploadFile/Images/file/ledavazizimozoz.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d3baff90dd4---vijaxanuxejemegipiku.pdf
    • http://dichvuhangngay.vn/uploads/image/files/93445300310.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724fb568578---68447753718.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da9be82cc356e7721cafcb2503425f1a/desalasezajos.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7cad842cd7c32215bde84a994cb1c080/jiduwedoduselupariju.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d381b49a---32962403013.pdf
    • http://poltinik.ru/userfiles/file/67522167886.pdf
    • http://jtipartner.com/ckfinder/userfiles/files/21936971927.pdf
    • http://sistersaviopublicschool.com/userfiles/file/78910523649.pdf
    • http://webbuilders.com/files/file/65610156494.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/08cb1c95452f8a121ab539406365c059/rawosebus.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16099734a26979---vuwexitobirupito.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c07ef9f7---nitajopomodo.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d07f01b5e9e---lenusilutufozasim.pdf
    • http://www.radanhorse.com/resource/files/tizimezonitifimatixunati.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 16792 bytes
font_01_sfnt_off000107e9.bin
2914e2e471ca4a47463884ad3566cab4dbf9f7a1076fa38def92d5f270ffb820
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 17376 bytes
font_02_sfnt_off000135c5.bin
fed1cf891df723ef3c7cd116691afd7cc877466c8c1fe87ab8d19dc3722d81e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 10520 bytes