Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d2c28cb45c8c5b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 15:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8547c6d2c5352adae1b306f7d4c96c61 SHA-1: e1b8644eeb5caf29afa0cb1cbd26eea1aec29bc1 SHA-256: d8d2c28cb45c8c5b3cc35f362eae0a7e05288ebdb322a728836ee4a326c395d4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the final payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lentes123.com/aym_image/files/fivikozelifep.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/509a6c13c4a1efa07f3a19cd60a613ea/18391903524.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609279c5aa694---netinujetowuwat.pdfIn PDF document text
    • https://soechi.net/userfiles/file/figasubazekewogasok.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/riguzefinizilezuvinul.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/66802747744.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/nexas.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e855a02b11b9e4ff70666e91db508ed2/34119660559.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/kawusunadix.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/lisebadojeboduginabalasi.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/43b746cbf99d5c71ebdb9a8fe2d06d2c/pigaliwudavodovofomirod.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/42328159513.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501054749182607.pdfIn PDF document text
    • http://chinazzjx.com/d/files/vifate.pdfIn PDF document text
    • https://chpcentre.com/files/file/97555270369.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f787a8ebf26---27520604238.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/45112174958.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/53510969831.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/lefepipofamuwelalus.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/75858061277.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/porep.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u4pkqt8jl5iu9ktkop6mudbf85/fisuviromala.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c300b3433fe---kitekirinomevikerefut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=consumer+bill+of+rights+regarding+tax+preparers+pdfPDF 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_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 11316 bytes
SHA-256: 0913cf72fa5f2324daaae61d8d430dadbcf88974fdc878d31226312d835032cc
font_02_sfnt_off00010d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2D 17524 bytes
SHA-256: 53507b7cd6be868771801135ce0e28caf3dfc2e360c1ce9f97a617996e18b3cd

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