Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d4c9e8a8dcf9bc…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 12:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e8e73d0c57073f6f74cf14c27f73f4ed SHA-1: df95af9b576aa20adf44997d21b2df0adc5bc0f3 SHA-256: 95d4c9e8a8dcf9bcb6a1a3156e818ee68394a81207541431c152771c33cdab5c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external links is a primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ffarchitettura.it/userfiles/files/lirezasanosap.pdf In PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/18918519405.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/a356529760215c8505f0b86a6528e7f9/zevowovigumotunepiwo.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/vuxonomojeb.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/vasukozevagesenuvigalap.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109101001288100.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/21673648815.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/45223988042.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415173dfe4a---xejov.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5fc6e0f4---78941741918.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/rurawomig.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/kelisoxubobodara.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109150221171045.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbaa3a6b49---20168187692.pdfIn PDF document text
    • http://popmetre.com/news/files/68818354177.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/xijuretipotunovuvixokogi.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903103048.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/lozosawozaloxaf.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/zugejeposorewulorapukuve.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1d8605b7c---fevogunolipejevep.pdfPDF link annotation
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141742f10e25---83781380994.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d726a42df6---nexuf.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a84a24fa83174cc1ddab29098e5ed506/foxugovuxudarudej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=messenger+plus+apk+downloadPDF 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_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 17920 bytes
SHA-256: 0ba381782c1009e5fee525ca0a4531489b9edf7030db0f6f327c5dabb2aa1930
font_01_sfnt_off00011343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5A 10648 bytes
SHA-256: 0a28334c48c50ebda34413eef5a18015492dcc472925bfc116f11382e5b70ab7

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