Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49127bc4035caae…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 11:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8edcd02bfd7a84bfa72dbe6966344dd9 SHA-1: 856122c96e4fdf7d5cba2cdc38fbeef37f41703b SHA-256: a49127bc4035caaeee0d0283ba015a85467a23cedde81ba22c1f4aa3ffd4e561
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. The file's structure and URL patterns are consistent with a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://oniceh.ru/uplcv?utm_term=can+i+bluetooth+photos+from+iphone+to+android PDF link annotation
    • http://kino-cosmik.ru/sadm_files/tovina.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/vunaxozaboteguwedu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b0566d7ae---dukafuvativ.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/20222650638.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/pivaxelevavetam.pdfIn PDF document text
    • https://mkontroll.hu/File/10011235161.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/nebifu.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/50483428446.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/ponarejevobopijisulu.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/wibirujunoju.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1aceb038d2aed0b5c7880be619b554fe/zawito.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0d7jre7q51m82k96bc9a14693m/tututojiruxuwejexokogod.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109172030487078.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/45636378670.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/66396993622.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bb727fdf---wixipugireluz.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/43829825803.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/muvagejuporirikekuv.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/8171528492.pdfIn PDF document text
    • https://maria-galland.ru/files/file/48585540050.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/josavimulekemosir.pdfIn PDF document text
    • http://hkalc.com/userfiles/43287852439.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/bawimidafukitutelodoxe.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/65491742652.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/44146157791.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/sejubib.pdfIn PDF document text
    • http://sdes.in/uploads/murixizavikuxurufurozowu.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_off0000cf23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 17672 bytes
SHA-256: b50be46ece60099b9f986b21377cf7b6c53d905a136a765e5efd6972365ba3dd
font_02_sfnt_off00011505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11505 11032 bytes
SHA-256: c3c3de3ddfea7aa251b3b59b3ab043cd4f544d1666580c81881a2875b15d69ef

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