Malicious PDF — malware analysis report

Static analysis result for SHA-256 84df4600006f7c9b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 21:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d008e7a671f29905f3ce20dc93ca7e06 SHA-1: 8fb2489c8ab59596df652181f42eedc4de9ba09d SHA-256: 84df4600006f7c9b845ef725b5035fa75aec2d09ebcd30e07e251e157b8d5289
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, suggesting an attempt to host and distribute a malicious payload. The heuristic firings for PDF link farms and compromised CMS uploads, along with ClamAV detection, strongly indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724187ec348---mojixavame.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c53476aed34---93344879846.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/kolobulukizosasuwev.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/koxuritobirapefizojefi.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/rijajipuxukur.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fba6dff54---79981348974.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1625178341.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210902/files/20210902033817.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6946b36dc---mejadikaduvof.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608032b5d45c4---82588480158.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/vojetite.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/13690986076.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/01dd669569144e576e88e305da015312/xefiru.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf22c360a---46210306532.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07ed2e49ae---suwutajafaz.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/12665208568.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/zolovazikusaxaraf.pdfIn PDF document text
    • https://new-baby.me/userfiles/file/23068744029.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/749226c0790c56f5f531d71343ef2072/23925954860.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/23/file/sexeridozalugamotira.pdfIn PDF document text
    • https://il-gusto.com/images/file/jikun.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rprqqo72js86up9jdbsrq2cc6a/robeniresameduditam.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b08b237df05---81746962625.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f263f0440---kegutuzizozakepamajop.pdfIn PDF document text
    • http://kunbot.com/upload/files/nosiliwilunusalogidudas.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/gixibunisenufiripete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=talasemia+pdf+pediatriaPDF 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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 10400 bytes
SHA-256: d1d9b4c75addd074f34eafefebf2c7e2f836cfbe1379dfa3cc21aa4ea13fbfe6
font_02_sfnt_off000106f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 19064 bytes
SHA-256: 5ef0cd364f9face87f068789e6ef908d3cf3e4639c29fd0310e743878434ff70

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