Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1c363300c8b10b…

MALICIOUS

PDF

85.8 KB Created: 2021-09-21 01:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5101fd61d42c09c0f238e93471a2a4df SHA-1: 1c8f056b5f5c330112f1960442b2a63305f548d8 SHA-256: ca1c363300c8b10bcdb6c7660f2442c34e12a42612844df1a43c1ffde23082ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as 'https://cructi.ru/uplcv?utm_term=fallout+shelter+sync+pc+and+android', are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=fallout+shelter+sync+pc+and+android PDF link annotation
    • https://www.delaneyllc.com/ckfinder/userfiles/files/42740023396.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376dd819797---kowijurukero.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/19632263884.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/dubalokosinoxurewib.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/76989586318.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109071504283821.pdfIn PDF document text
    • https://cakkue.com/contents/files/votibagufopuxakux.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/ponesogotep.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210921_DB9FF16C117AF2ED.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/juligamopuruladawuv.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/lisavemosi.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/99416491988.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/59895322598.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/10/xugapuladalagemuzurujagod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a8fc49748---33922905540.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/01faad93d6973d2a953eca2628062741/xakukarawegesu.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/fegukum.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210916095334.pdfIn PDF document text
    • http://datcat.vn/2018/file/movuvob.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/41199248970.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/51409040978.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/57648711707.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/60824423498.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/vakewakewofavonawo.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/zuxizi.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/zadejikixip.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_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 10804 bytes
SHA-256: 94de30fd27773d0375a0dda19311f68d58e598a9b200439a7bee7ce26f49c8ec
font_01_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 17700 bytes
SHA-256: 8fa03fee73c7243f8790cc7a3d841159314d904fbd13963366c7895628c77c86

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