Malicious PDF — malware analysis report

Static analysis result for SHA-256 928b74f30999734a…

MALICIOUS

PDF

78.6 KB Created: 2021-08-17 03:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d3a4b9e3615ff636e59a18d648aeadf5 SHA-1: b049fd39f8f872dcbe336499a855823d9a26183f SHA-256: 928b74f30999734a209eb36ce1086761f1f7de2a787f462c2f6573d8c167aee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to disposable hosting and compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL heuristics point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611afe94c07a7---93784408791.pdf In PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/bererawimijumewagolig.pdfIn PDF document text
    • https://fallsplat.se/file/82501441899.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/zegupub.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/93526403106.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/namimolakabutosup.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/81795320013.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nc17mcp3higpt26r4ebm31ddsu/6801718014.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/62434755021.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/diwifijigukubugoge.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/jonidunivaxes.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/93mgtmbgr8s7en22v07is092f2/forivo.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/fogufajudivepuse.pdfIn PDF document text
    • https://alutat.com/data/file/11044873060.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873e4519815---reguzatotopetamorezemomim.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/fajasodezijilubaxukexeb.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/vidugumefiputurukodizizif.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/25177332216.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/21297465028.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/81239909422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=diferencias+y+semejanzas+entre+caida+libre+y+lanzamiento+verticalPDF 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_off0000cb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB40 11148 bytes
SHA-256: 59a100368e18832b64c5ad6dd00258530cdfe4f09a1a234ec77699414d28c5ff
font_01_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 17424 bytes
SHA-256: 8609cb62cd66d8452618c4ea5fd15397c809fdcb96a7c2e9bcc315c94b408373