Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2ccbd58e5ad683…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 11:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8fe2020e02d28b16aa50ae3d3d588cc0 SHA-1: b339fb36e03d11d4680a31b509a1a42b43e6d15f SHA-256: 5b2ccbd58e5ad683c04767a19fbd6f57d72b86ee5efac996c228dd0ba45a03c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=ios+gacha+club PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404fdfbbb8e---mitiki.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/70114029199.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/vebisaxegoda.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/veroxaforefin.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/fuvazoz.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/bonutufipovekir.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/6054362812.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/70999789582.pdfIn PDF document text
    • https://wrd13.com/force/file/xikibulizakuzatujebovomup.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/83848073630.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/79264909009.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139bb30261---16362536628.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/12819557300.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/78778621471.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/oeth22q2010645m0i301og0dug/wipepupefitadoropokix.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/66146915794.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/80363020065.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/wilulazoxerogonagele.pdfIn PDF document text
    • https://iwistw.com/upload/files/42914138798.pdfIn PDF document text
    • http://suyogmaratha.com/editorimages/file/lipotatevuzaraf.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/35569628183.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143a2a86c199---wibugut.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/moresetoxarikibupugom.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/37715702529.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374929b199f---57835833745.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/6341859124.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_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 18844 bytes
SHA-256: c08321bef42b85db7f0d91df05d3039d1c96eb179533f9e695bf256f992ea375
font_02_sfnt_off0001233e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233E 10176 bytes
SHA-256: 381fad629eadaf7726c3c1e9e4f93ff794a9699517312436efe6149503e80bb6

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