Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e35407aaa6afe6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 06:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2f52c46e2419cb58f28a3220421e45b SHA-1: 9dd92e5fc079860450e520fd76d58ff2f7de706a SHA-256: 80e35407aaa6afe63462dc57ed1973dc495131c9c70af8047b489914c522ea7d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=happy+dice+app PDF link annotation
    • https://et-auditing.com/userfiles/files/52939088703.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139537765374---xetigega.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/42634193769.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/timuxusoliguponimafigez.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/16722502948.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/17124071266.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/mabigokugo.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/74575312157.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613505ed66033---lazidebemujo.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/rovegirofu.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/60159096855.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/jisegelaja.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7625eb2f---63608354340.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-7/20210907022127657053.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/f8009633daaceae36828472e04104a4e/71676581088.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/14cb54d02ff826523f4174e373673b58/bosil.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/78010261847.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nukaxovexowu.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/92415679473.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/lezonosit.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/24932862267.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/59257176530.pdfIn PDF document text
    • http://africareview.in/userfiles/file/pafaxafitotemopexawulexem.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/44704177128.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/97190601082.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/galosabe.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021971049316964.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_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 18300 bytes
SHA-256: 826256e475035c4ab5bf810b1f36424d7517833cdc3090ab89c745caf94c4938
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 9976 bytes
SHA-256: 2123f0825ed0c3f807f7ce1e0ccd93cbaa2bb7ef60397bf6c5d3f34891940953

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