Malicious PDF — malware analysis report

Static analysis result for SHA-256 9daaeff73885d438…

MALICIOUS

PDF

84.8 KB Created: 2021-09-28 12:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8398c7f718f84c728c858cf297c5a704 SHA-1: 041534f4e8833958402ab3b6cf3995d478700b69 SHA-256: 9daaeff73885d43861596525300bf5fec65cef136b4cd88e0fb175704750876d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://catamma.ru/uplcv?utm_term=west+gunfighter+mod+apk PDF link annotation
    • http://hepiran.com/cache/fck_files/file/39126321019.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/52468353694.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/wopuro.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/rumetimasilediwixebomof.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1418351259614206a7a9d27.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/43641013715.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff65bb8d08---47622108224.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/23151921995.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/97502777244.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/58040218383.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149190534ec3---kenorigajejekunab.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8ce049522---35596800738.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/zaverido.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/tuboxazakipo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a404868693---42470437157.pdfIn PDF document text
    • http://azizolace.cz/images/file/zidexufosutoxaxax.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/kinerudubuzowipigemux.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614faf9adb9ec---kutasi.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210905_202839.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/pesipaxolidexa.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e3db6e3c0---lenijunobojoseda.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/sijadomosubuzadelixasesog.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/xamemujes.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 20700 bytes
SHA-256: 251fb2b6065f75376d2deca86a7ab14d826530315f10d11269f44020b9a5fc52
font_02_sfnt_off0001160d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160D 11084 bytes
SHA-256: aa51be94851e95ad7c3b24b3d42fe62b8db48199e59c6235737140b10468a5ae
font_03_sfnt_off00012f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F88 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34

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