Malicious PDF — malware analysis report

Static analysis result for SHA-256 45950ccce79f067c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 23:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ea112e5e633db9ac48554b558d03a30 SHA-1: 4bd1f22779c0b31ea8247bb2f0d655208bf5e6a2 SHA-256: 45950ccce79f067c596262d766fe68362ad1f9d4f059fd8d2f2865e7789ca270
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614149880efd7---fuxubasewixanikeb.pdf In PDF document text
    • https://cplastik.com/data/cms/file/dozoluviborupakowase.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/9pmmqfu6sgas80r4e0pn2s566p/sowisupo.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/90624809780.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/jiwunigozi.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/58673888469.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/xinilumupisatadodumalare.pdfIn PDF document text
    • http://zatacorp.com/upload/files/nufirunalod.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/2259265503.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb679dbebd---vafoxixotukuxebajukisemi.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/95923524644.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/mexojo.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/sunefizamevokidiloze.pdfIn PDF document text
    • https://ismart99.net/upload/files/62746797355.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/62817045180.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/55c715e4416580e81e3060778488a205/48799362234.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/21840940829.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/wawiduvoguxekivuduk.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/12482616765.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/fowoxefisinuniwa.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/27346360129.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/rikorasevixinisadita.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/fasefepokuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=max+dirt+bike+3PDF 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_off0000dc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC22 10300 bytes
SHA-256: 6a084b2fc5ca21be918e9552ca0aaa5b1efd28e787eafb82bf0f453618804522
font_01_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 15868 bytes
SHA-256: 6be9d3dc019bd476a12b10cedfbabb5c31a62f4a8217c53b99310361b74c3504
font_02_sfnt_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1