Malicious PDF — malware analysis report

Static analysis result for SHA-256 187da5a9de8b957b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 22:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: abc72a7b3843d2fbaeae1dda44940115 SHA-1: eaf38fff0a4ef289a8d042798c7357b568c24cdf SHA-256: 187da5a9de8b957bc242632fa04eb87110665f87f6530fc17d670df3c05c878f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many hosted on domains that appear to be part of a link farm or potentially compromised websites, suggesting a phishing or malware distribution attempt. The presence of ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a download or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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 https://topclassgreenery.nl/images/file/xezopibote.pdf In PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/284318ca9071682b9ee2abff428f9b14/52826166159.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cafaee005b---40029685439.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/72725499741.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/tiwefisewowafoxome.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021071719505070554.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/19442237393.pdfIn PDF document text
    • http://land89.com/ckupload/files/bisatodewobubelusol.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/20113010300.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d0b21ba463---doruzefojedoxepus.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/d59a2d027c771cb3200d2696388111bb/42664174616.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/64997193072.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60d019c9c5630.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/feketuzireziwe.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/bd3147ea698f9b15d43a385733a30fdd/tigagusolubi.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/88700953464.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ac7f5866f---tuvelewojeli.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/85883930229.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/49609247986.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ba4653695c---digaxarelepeladukopibor.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961720d2b03---5496456079.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161268c0cbf1ce---pinokawubiragusuxatavotez.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/74527471366.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d3bd9d7f---pumotosudagiboniwejoxuse.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/niruvefux.pdfIn PDF document text
    • https://music-group-store.com/upload/files/84032576331.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/21937175282.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf8bda4f4---53504718307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+reader+free+download+onlinePDF 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_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 17640 bytes
SHA-256: e83cf69d4155946bd3ef0212bfbaffbd36c054f6ff652c6c5735984e2e596993
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 10168 bytes
SHA-256: 1427583f91fb9b35cdc25829a221a451742667567a8b464dd6ddf28b28876ff8

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