Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb2a5a4a415dd2c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 06:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 913d1b6d6b71f26cabe4f614c00b3417 SHA-1: c39c27ab737b141699284085b4db5ad276695012 SHA-256: cfb2a5a4a415dd2c67590832dac6c72b65f1de7531e7e3dbda06eb841317e20a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external URIs and the nature of the heuristics suggest the PDF is designed to exploit users into visiting these links, potentially leading to further compromise.

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 https://allytemp.ru/uplcv?utm_term=download+edjing+pro+apk+full+unlocked PDF link annotation
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443bb60ea2e---pavarokogoweripomeru.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/pesevesop.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/86818767436.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/xugetapopijijedewamurisi.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/19433607735.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/59869387146.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/19311794148.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/bikegokevigiditojutu.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/dotadezibuzaxezumigimabap.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f535e78131---69170833423.pdfIn PDF document text
    • https://jobtiara.com/files/files/manitadigirina.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/wavinetulariloniraf.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/44780469557.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/71692933343.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ffe15043f---gevimutevumelokeganaronat.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/90333002319.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/lugadisitumavuzirimajufu.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/16904359505.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/89074078337.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/kodesaxefotef.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/38258203000.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/sanuwu.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/banemugutexotepaw.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f430d5d0e---dizulomol.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/fuxagegasinezem.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_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 10936 bytes
SHA-256: a060ff17453833d46afd08f58ee0c89e9433aeb62ede8bcb154fa0cb27222f7e
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11084 17624 bytes
SHA-256: f6260e8f1441c631fde47ee134b4135408f5c037d3a57cfe8bdaa6215416d3a8

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