Malicious PDF — malware analysis report

Static analysis result for SHA-256 01dbd6ac6ff2ca7a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 06:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db4e1311d2360201f908ce7d7ee52a61 SHA-1: 2dc489d00c934aff92f7a64ac78c5b179c66ff32 SHA-256: 01dbd6ac6ff2ca7af82d19e1145ab0cefac81f185ad26e2339ea816cd11625c4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm pointing to potentially compromised websites and raw IP addresses. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sdds.be/userfiles/file/23005601806.pdf In PDF document text
    • https://zlato-stribro-investice.com/upload/files/58925607478.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/190aa78fea450999259d95285bb02b7c/47836264749.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/tikowulalewawibeliz.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/17247272420.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/61699529813.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/zubotu.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/nebukiwujinaniranipixor.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/gopitejaxonijij.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/sadosim.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/65472306.pdfIn PDF document text
    • http://ruihuitax.com/files/file/negumafomotu.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/50815762378.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210914005828.pdfIn PDF document text
    • http://topflexsports.com/uploads/91538059029.pdfIn PDF document text
    • http://anpharma.net/upload/files/luvutitonojifepunagi.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8269e6f2---64088272475.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/dakipogazikagub.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/565642440.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202108312252223233.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4d98f9dc8f86f74c6d3d91b18b74005d/46501560049.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/75475137244.pdfPDF link annotation
    • https://un7un9b3rl1pa7-99.com/contents/files/80263694831.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ronofixoteliwatitajig.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/34595311082.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/gaxax.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/83530893092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=custom+rom+samsung+a51PDF 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_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 18496 bytes
SHA-256: 8c3cc5234b6efee3c354b8ddc7db717bbd8399a4db3d337c0b4d5f1f2a912acc
font_02_sfnt_off000125ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EE 10500 bytes
SHA-256: e36d5787c144db1b5cd4f3830f787f8e52c51e2d4d81f3e22cf6692b33f9cf95

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