Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8c92484e7479a7…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 16:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 466ea3f4d6b7339457907032b86bc365 SHA-1: b7fa99b7b09f3b34547eb73b1128f960f043e309 SHA-256: 8d8c92484e7479a7d0edd56efea1cd5ff8be6d3bce92187c93dba10b1dcd13a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many hosted on compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=the+demigod+files+the+diary+of+luke+castellan+pdf PDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b0a1c16e---kuvaloperusisowexozo.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/lizozoluduwu.pdfIn PDF document text
    • http://adveotec.com/img/file/13066724029.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/kewutuvekepibumamubep.pdfIn PDF document text
    • https://blokhol.com/upload/files/80346701017.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/55019297523.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/guvumizuralesobukisisum.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607770e5e1e8b---3655478381.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/977469836.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/53473123306.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/2077025121.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/33357556711.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/23812785839.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f1ad3d5afb827f19bd127866bff91b78/1463574522.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/bcf95b8eda4ba2a15937f46d313d51ba/35417301295.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/22500915768.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16103f7dd5b019---14896664350.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/debusimo.pdfIn PDF document text
    • http://m2m2design.com/userfiles/36701100247.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/kapodilaripul.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/47947559306.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/47505729943.pdfIn PDF document text
    • https://ikansambel.com/contents//files/dogifakujaref.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/50594366783.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/sobigedisimovovadolube.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_off0000d13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13D 11336 bytes
SHA-256: 71ffc2ca76b03445bd4bf00b6c46f20243d5400d2fc1bd7344870c225dbe84c5
font_01_sfnt_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 17776 bytes
SHA-256: 150c5063d38b54d78ed009e89f4e46f94fa73eb860529b7db2d72d4a5541942a
font_02_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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