Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af3c98d82135c6b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 07:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0051532cd8eea85d6d59e778c65eb762 SHA-1: ff5b6b2b5f636d338276e91b39372421fb999123 SHA-256: 9af3c98d82135c6b8de202fd308db4e67d677e775056b79754660ec3a73baded
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document's structure as a link farm suggests it's a component of a larger attack chain, potentially leading to further exploitation.

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 https://natatourism.com/userfiles/files/jokifapasoxurag.pdf In PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/13088918653.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452c420e48c---mumubeb.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/tamifovafigofusexa.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/jubig.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b5c7aaa6---46557649162.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/mosajinugaburumalalujo.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/dajonuzasuv.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7ca80d593---rabavitosofojavusun.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/babudekivizakifivowefan.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a91e22a073---41447863465.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/54114284884.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/sekefolesapaxosufofaxefa.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/21884651783.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0c13a8a8a58d149bafe540b540ba3e5/68319330906.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9m487n8112p102cetr29mbpnl/24001150229.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a7ba4302---nigoxivaxinoguge.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/75687115568.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/12041074200.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417472a31b4---fuvasazorenapesimarajijog.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/gonibubef.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/16900971867.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/47745115968.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/98751621796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+hows+of+us+full+movie+free+download+mp4PDF 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_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 10960 bytes
SHA-256: f6ccf76925b5cbdfb456d3a4534adc80b4743aabe48b5630ed6499c2c77770fe
font_01_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 17576 bytes
SHA-256: fe2392b70bbda67429ee3ba153ac4eec870fe71a8d355d078ff905cc6fd15176

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