Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf1d0d966836baa…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 23:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fffa3b45fc1783d16ea40e0bfe30b495 SHA-1: 72d66c453d7e5661870da2cfdc62870e5a522e65 SHA-256: ecf1d0d966836baa46700abd66f315fb479919a511dc0250d4f429a074a9c62b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://galettedesrois.eu/userfiles/file/17798252736.pdf In PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210918/16319011134170.pdfIn PDF document text
    • https://castel.ro/userfiles/file/16611775056.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3638ed2e9---96354707782.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///54768159845.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5p98n9ajm4k1sh94jvpod6bq8p/lawerozevifonofebis.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/31671290226.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091715550141.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/xakadopupel.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/widinilexuv.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/55614295971.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/98101888323.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1ddb4b1458a9a711e4cd39c52ffa44bb/82512601802.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/xererudi.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/felalidufan.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161505eb4c6ba4---fomupopebenovonibasegiwug.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/31649051521.pdfIn PDF document text
    • https://anpheatingandac.net/nbloom/fckuploads/file/83793641661.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/51950529584.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/bavokezabewuwikefoja.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/4963353245.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/91501281012.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109240653157742.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/96384993663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pixel+gun+free+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_off0000b13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC950 16480 bytes
SHA-256: f00aa7687282401a2f6e53f88e05aae63e59f2a10e95fb640bb60e49cb781c65
font_02_sfnt_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 10552 bytes
SHA-256: 80387340682e38a5c1934b8685c75449c8ce9296d5a2e94b936227684127f4ff

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