Malicious PDF — malware analysis report

Static analysis result for SHA-256 34238355f39987e4…

MALICIOUS

PDF

83.9 KB Created: 2021-09-14 03:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8fa6a052bff69ce1155c671d48e7adff SHA-1: 80184857ef5d764b124d33053ebe5c56ea19836b SHA-256: 34238355f39987e48082b48bb3ede89f39fa61d0691730dc5778fc0ef70c3356
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to host or distribute malicious files. The presence of these links and the overall structure indicate an attempt to lure users to external malicious sites, likely for phishing or malware distribution.

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 http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136249e4f13c---gevetiwetumeb.pdf In PDF document text
    • http://chikatere.com/Upload/files/xemine.pdfIn PDF document text
    • http://zenkatsu.dk/files/8560877552.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f48ee2a6e---zivul.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/dujave.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7d288bf8d4a58e63cd015f5cc8e7c524/67462516264.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/kamatiwejig.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210909070204.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/bifupa.pdfIn PDF document text
    • http://yilip.net/userData/board/file/meluxuxilelatomimafed.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/74916909386.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/24526167766.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210907080500.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/601937064.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cde304cc9---58412409412.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210911100310.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16138135d019b5---4073231583.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/40155313259.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/26110450948.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/jekubukojidozusiwidu.pdfIn PDF document text
    • http://svx.su/ffile/file/gozunizowizulakerakikaten.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/39236079897.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/12343179954.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/49318576850.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/likimek.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/91301935335.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/76253085182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=most+poisonous+snake+in+australiaPDF 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_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 10428 bytes
SHA-256: 760d4f796b59e2686f9fc05f0c6a739f4ff8b165505b1c391c36f74c6d0923bf
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 18060 bytes
SHA-256: 4e4c00a0a951a1518447c5253368c63451efb485e278f29963ae3993feb1e96a
font_02_sfnt_off00012935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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