Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bd2954a252e761…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 10:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9cddf7d20a17731bb876e73e0409d18 SHA-1: ef49ad7221ae1229c2f013cd3ad211233a3e25b7 SHA-256: 27bd2954a252e761a21832fd74b0a612e01996c38b612cc3ba6a6f2b96330491
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and compromised CMS upload links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/uplcv?utm_term=vision+ias+monthly+current+affairs+pdf PDF link annotation
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/j5kteke9uard4vao998faotsqu/41001342348.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/zefonokixofabogodojugaxu.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/66708442886.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d10fc6481a---78883030642.pdfIn PDF document text
    • http://kalikraft.com/images/file/simubokaravodapijeki.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/21654015695.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5675a19dda596ec095a0dd5cf857ea18/sagolomurokoxanoximokopik.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/cquccsuqn0ta2ommbgd4eghf01/gexifezadub.pdfIn PDF document text
    • http://tipiland.net/upload/file/31270889500.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/derijolegumunaze.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a177be8572b---xopilofanetuk.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/97f427ac4b8d52497d7496768d218ab8/fegawedibodofowuxa.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/ximikojukobufikoj.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4356a1d0e---joluseselewun.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/62895696952.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/dfd331e8bd57ba71acad95c2c1fc674c/83822155367.pdfIn PDF document text
    • http://alkanboya.com/files/file///7085624692.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/53867210403.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/29994991987.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/gulavovede.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/57379935696.pdfIn PDF document text
    • http://vladekoservis.ru/files/morovatofederemi.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/14906436717.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/17163584489.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_off0000c268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC268 11068 bytes
SHA-256: d15d99f29b6495b13e58f47a0e27341a6f5ad2c7609d6e6a4c235768308b7798
font_01_sfnt_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 18376 bytes
SHA-256: 12860417616ed1a51c50334dbf98470a9eb5c3f12107b7ec69730b129bf04668
font_02_sfnt_off00010b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1