Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4fb53079290d05…

MALICIOUS

PDF

80.7 KB Created: 2021-10-06 00:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1b94d2b917ae7e31df1e07a0f2d1ebba SHA-1: 5630f324b85625d288b1ba87d6be1831ef0d4c35 SHA-256: 3a4fb53079290d051eac30a7d44cd02193646e5a355f73ca8acbabaf1b053375
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is sufficient evidence of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://onlineauadms.com/ci/userfiles/files/xevudager.pdf In PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/5087577488.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/pezifi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f737b8b490---70938383177.pdfIn PDF document text
    • http://erex.hu/upload/file/gaketofezurunazupadego.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/pegiwula.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/8266908734.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/42263915937.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a505d4448f---rimanibewibek.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1632611830.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/54309623476.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/40258839446.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615b4de62883b---verebubodijarudunuxodikix.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/pumilisitikolarukoleko.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/tixufoworukazelobumijid.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/93649456249.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/14224545907.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/29607216452.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5d2582f8b---balediguvevubijonotuv.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/45069493744.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/33684534336.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/79816968917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=modals+exercise+class+5PDF 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_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 10392 bytes
SHA-256: 5bc703e591bc15fdffa6ca8fd3b8ed7d2e96edd37f54414b901214c7075ce82d
font_02_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 18272 bytes
SHA-256: 9ee0332c55c33ee7952cc426fdd440e16fc18aa955143ed585aebf781c669ac9

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