Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4111edfb343c7f…

MALICIOUS

PDF

80.4 KB Created: 2021-08-09 05:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 3e7897eaeaa738ba6a09ad31db2d76c6 SHA-1: fc84173a3994d8f9f22e281397a05b3ff71b872b SHA-256: 3e4111edfb343c7f8a7fa6c07ccb7f5d5b1ee6bd3df713a25ef22d5a23b76b64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jatyn.cn/upfiles/202106/file/1623893763.pdf In PDF document text
    • http://hasyo.net/files/file/88979111776.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/35849953145.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/35f1eeef4c46561ee613d2bb334181a3/62335813926.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/47971115718.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d3761ff04---tikuxepolizitijebuwuw.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/vanubimuguvobo.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/rigukukilozixekuveduta.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/90974402071.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tavemuvozowuzozanepagaxuk.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/nisiferu.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/35299358802.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/59368604297.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/wunejinumuguxabino.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/pozezegaxojodek.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/42451373366.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4faa37cd6---nufedezafuderonaja.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f253a4f647---33644964397.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/sulapitatudupopibixepub.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc7d416170---89457198163.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac757da0dc---jogejijo.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-3/20210503071453125297.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210629232453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ben+10+alien+swarm+1080p+downloadPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/guduzobowefaxupekoxa.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_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 10976 bytes
SHA-256: 2f56a3f0a4ddbd83bb987246dc73825aa93351a92cd5115a7b26a56fd8dd87b0
font_02_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 18244 bytes
SHA-256: 9c54dc5da85673815670dd7268e0ded0bff965a9842b3336508ab9f0dc2047e6

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