Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa8e94873bd4410…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 00:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d650178ecffdba932587566722e13d74 SHA-1: 0f8863d0488aac3b973f9a3a707a499fdf2026ee SHA-256: 3aa8e94873bd4410dcd8051a1ef81db178c2574d8f85ca323a51812c85f937a4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://classicalgardenornaments.com/uplds/file/65575630986.pdf In PDF document text
    • http://munnarinfo.in/userfiles/file/finurakasovobufeponewab.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/60599794450.pdfIn PDF document text
    • http://apothepharma.com/upload/files/49448036425.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/29241218053.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/fimugoxu.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090504245873499.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/88112319027.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/71627810227.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab889d111---motujipevuxibowiger.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/29696861231.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/78574676234.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/jemasigikogo.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/40772749747.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362bfc53ca2---ranewufepotemetupesatoda.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392670afed2---27691909562.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/magomivagotukuvimazede.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/muxirafuzijusixa.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/70862641417.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/60248914184.pdfIn PDF document text
    • https://upaspor.com/resimler/files/jenojosorutuba.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/tosarijodesavigudolumi.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/80800518941.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/31548054362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+send+hd+videos+on+messenger+androidPDF 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_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 10792 bytes
SHA-256: 8812371edac9ef02aed193d5381a642bff161c70b0267ba273560c3c6f1ced6a
font_02_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 18224 bytes
SHA-256: 782b6c4aa22f457fb9690a0ce921177ea4dfabe8b65d4261d3194bef3d9fc208