Malicious PDF — malware analysis report

Static analysis result for SHA-256 483f9b595f004f59…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 12:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8003dd059011546d415fadaf153da603 SHA-1: 717bdbebdab62724f7665e9637895ef70e731808 SHA-256: 483f9b595f004f592d0595573f76b187b45b3554ef44b8c1797cdabbd3b6db16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting sites, disguised with a 'download gta vc apk' UTM parameter. This suggests a phishing or malware distribution attempt, likely using a spearphishing attachment as the initial access vector. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious downloader.

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 http://change4best.ru/upload/file/dexipol.pdf In PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9b12788af---paneruga.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd8c0f8c7---laminaf.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16317482841828820645.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/dusakulomalununuwekofan.pdfIn PDF document text
    • https://latarnik-kopice.pl/galeria/file/24796868677.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210923010508.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/dujinomomamoloxori.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/pugezavagur.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e239ec125d---58419651195.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/jorefib.pdfIn PDF document text
    • http://zkpower.net/upload/files/wilozejazuj.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/putamijedibudilapederoza.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lejapafip.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/dolosupiwaveti.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/jorasejafepokipuguxidojo.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/61188788893.pdfIn PDF document text
    • http://leguido.net/files/34304130716.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/tifenobojijexajamo.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/bobofuvimokotugisudisotov.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/90993741020.pdfIn PDF document text
    • https://phunhai.net/upload/files/21167169331.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137493f71a38---kuzulepavuvava.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/89281626415.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210923070948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+gta+vc+apkPDF 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_off0000b2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FC 10440 bytes
SHA-256: da74ca684669b2d5234e5a8b4db6dca57249c72742440f2a82892fc91a529a81
font_01_sfnt_off0000caab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 14908 bytes
SHA-256: f680c49bedb47de163d3e06be284d1bf45e43856e96960b03e1b484dc9dbf723

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