Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8c924c7beb8924…

MALICIOUS

PDF

88.5 KB Created: 2021-06-29 08:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b8afb28628e5afe4d29b617bbbf7f5c2 SHA-1: ba3fe267930968f78a42fa5f7e9a7873a43e4e54 SHA-256: 7d8c924c7beb8924f21c3acdbcc9c062ec2b0da93ecafea12aa30270c276af46
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c3f7c43733cda97421c33ba379524bba/78798121657.pdf In PDF document text
    • http://eperon-kochersberg.com/img_db/36166439793.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f499ecdc---2298910725.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e8936d492---nixilakusedumedot.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/wewisaxibaxikatuwubovu.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/dipapozu.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/723164c18a7cc16b5c2eb305c7a22344/10166562655.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/582fae626b8e80b10a95e391dfc91893/70851203863.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac5f8357da---92820988011.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b210297703f---jovetarefosenetafuta.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/043harej38cesi3sjsk4ip2hep/18871809348.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b143e548cf73959d42d222a74731c86d/tiribobodamupemisedugodo.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/50281750932.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/fixotuxeba.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/93370367827.pdfIn PDF document text
    • http://fitviewer.de/files/file/romisi.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/xawisezimipabotunixofibi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756d213b452---sidalemesiropome.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/gapurivekonasazukoloru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=piece+of+informationPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3c52abc3103607b87caaa04fea8a27dc/xerikilojudisatiwododim.pdfIn PDF document text
    • 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_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 10284 bytes
SHA-256: 4eeccb08daf9bda2853a7f108f3a4a98c91d76a895ccd8d435d2138ded73ac17
font_01_sfnt_off00010e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E23 18104 bytes
SHA-256: 4f09d2b7e865f657bb51045c5529b70f822cd94ae322b1fff86712ec54fcced4
font_02_sfnt_off00013ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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