Malicious PDF — malware analysis report

Static analysis result for SHA-256 963367ae7cf61b03…

MALICIOUS

PDF

97.7 KB Created: 2021-10-19 21:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b50e9f24da1117f825569157eb76aaa4 SHA-1: 1ae9af64eafca3ffc6d94abe35c3f8032613f7b5 SHA-256: 963367ae7cf61b03030bdbd82e17a88f3f99d8c1296a69ef65652dcaf27deb7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://special-pharma.com/upload/files/30559240726.pdf In PDF document text
    • https://sergiomauri.com/images/file/wopesagesevaxadape.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e82d4940f6d563acf565cae7e2b868be/gojupufelawuxodijitonokex.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/2698080248.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/78764520245.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/bomapisi.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/pininalofogejebuwifufuw.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/romeg.pdfIn PDF document text
    • http://korytnica.net/data/files/xelojab.pdfIn PDF document text
    • http://bastola.org/userfiles/file/kamebavafupeguwabotiboze.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614407e0a5cfa---20132460646.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/268200337.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/82802680427.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/tupibibiwezazawifomod.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/10033212779.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/wudomufolonogojotowid.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/juzivafewekalomuzelemor.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/62459749878.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1633138419.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16148018654278---kajujizuzetudimuw.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/voxanemofol.pdfIn PDF document text
    • http://cafecontinentalmd.com/uploads/files/30355078900.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/gekogozimosixunolitox.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/vizut.pdfIn PDF document text
    • http://dubiliergarten.de/uploads/files/3706961635.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/Z3ufxtS7Wvw/uplcv?utm_term=comprehension+passages+for+grade+6+with+multiple+choice+questions+pdfPDF 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_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 18164 bytes
SHA-256: 0e865ce22048edeab57424ef2f9452281f97cb3509701c3d1aa6b60f77ae7182
font_01_sfnt_off0001451b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451B 11596 bytes
SHA-256: 9c15a6b58d1ca550ed2ae61193e2e4b7fba2486f2d4a66a7f9df59fc2b8a9cb3
font_02_sfnt_off0001600c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1600C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1