Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bcb9625b279470…

MALICIOUS

PDF

87.3 KB Created: 2021-09-24 11:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7e5f50d38e1a0dccad6fb75f1cde860b SHA-1: 17c4203e79b3ab0c94fe7a1346df40b7e8673167 SHA-256: d2bcb9625b279470c5e6d1243b17ff4cb13ab05a03e97012cd1a37f836fbbbbd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also includes numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=frog+and+toad+together+pdf PDF link annotation
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2a817333557287d419b3c8984350161f/59357011847.pdfIn PDF document text
    • https://tuinvandecruys.be/file/nufagis.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/17927295573.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/72464300595.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/posuruzegokaporevep.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/sogofijeniri.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/9108493659.pdfIn PDF document text
    • https://fong-cai.com/upload/files/nurimibabegebop.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b69bf432---dobukiwobapatikug.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/gaxuminagepate.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/golokexurejidilidi.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109062101026727.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/bumoposopovi.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/gofenofirivupuduzujepuni.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/temowulexun.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/84824946732.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/60839759440.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/rotafufofe.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/29871996619.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/77421897608.pdfIn PDF document text
    • http://glassick.com/userfiles/file/lukaragawixegefe.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090112494939.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7009cdfbd871337e171c0aaeccdee7fd/28221860550.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/sajaganozotoj.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_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 19064 bytes
SHA-256: 90b69fe2fe305ba0f9fa3aa0f5b1a75183cb98b248ef37f458caddd63928bec9
font_01_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001381e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381E 10448 bytes
SHA-256: 60564a128acc43353861793263d3d847260e8efe192cfc94bb5ba7460995dbd5

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