Malicious PDF — malware analysis report

Static analysis result for SHA-256 8587e1f7f47420e7…

MALICIOUS

PDF

88.4 KB Created: 2021-07-17 03:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8453c3b1397de62ff5d7fd8594ffd39f SHA-1: 36d1395f268dca6e67b43b98ec843b61aa2dc7c6 SHA-256: 8587e1f7f47420e76275b91c2f0b6bf5d81742e197a3aab5fc8f515977c031b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://andlupa.com/userfiles/file/58128793178.pdf In PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/64641464579.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5b7e5d853800b160bf750b9fb82fccf1/lelus.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987db0690ed---68956368049.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0b65b3ffec76db638de51e175bdce07c/28976464813.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/zuvitedofuviruwezadi.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e788e213435---gotemoloforuvuvujekute.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f76c030d2---ruxovatedujawusigono.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/i18b0n9ahjelps7kqsk1sdb2jk/64510265832.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdee9c3f126---nabovejigeluwozo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pexuzidesaz.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be6c83beede---tiwijuzita.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944b93aa70f---janujapenesezivun.pdfIn PDF document text
    • https://buyafranchise.org/files/files/kesibibepobosanujed.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e09b0485ad1951810a75f7bdfbf30998/78800156317.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3hcijs4lmmbb4krre71tqd221/samobezolifekixe.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/pawawemeliwevemefagajelo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080252de3fb9---mideremiwasuzikuf.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/turuki.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rv1035ggena8t6ql1vpqpndqe0/vubotawamize.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/434nomgs4u5vkhi9uqine00gvq/wanovebu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/366a93607d4c6c765d45c09766eff126/fibiledusorumorozokudawor.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/u36dotdb6bj4sdr9t7m23h7f4t/24698586744.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/13539414463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=acute+leukemia+survival+rate+by+agePDF 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_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 10844 bytes
SHA-256: e8a7daecce0c120a5bdaf8f1e8f21468d0ba2542e410440173b558f17d0f4837
font_01_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 16968 bytes
SHA-256: e66f5ececb953c72595024177f363c1031ff5edaefa794e4b571aeeddf7927fc
font_02_sfnt_off00013bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.