Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c75da303fbb35d…

MALICIOUS

PDF

69.9 KB Created: 2021-09-03 16:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ad591306282fb297a3c4841d8e1ed06e SHA-1: ffa1d9f38fdf36781d17355864bec7c26c131041 SHA-256: 54c75da303fbb35dc8e0b6860f45c4abd225eb8cf1fcf6baef82461f85ee2131
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/bfa7d9d39c0ef3a7980edd4fd89f4555/favulodes.pdf In PDF document text
    • https://eetravel.net/file/81248566864.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/55145131342.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/25278241959.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/kebuna.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120b76269bdf---66155470692.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90c8598bb8---4991206186.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/0f66682e0162dfd1ea22f7c64c8c3a67/20717483281.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/vekuwusinebepi.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/biwakofopawuxedegizi.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/59877942120.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/15816334f8160636b601b770cabe28dc/sosofofufagilokolepeso.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c0bc6035764ac6747abbcc8e2e5a65c7/sogonuliwigovepe.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/nelinuwiturawonupakogijo.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/5mg1e5n8a2odci9kgip5mpl1r3/90608746342.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/dizezakanivaxani.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/woxeladuwodulisatopik.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/3315068679.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/41857882495.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/js8ltvpdphe8hmle7sb67sebq4/24908486777.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/35e4f6be8c15363bf8600f94d4c523dc/rovamewevodogitalano.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/12979863592.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940cb0d95c9---xuxexog.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/3725143489.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///63063391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=combinatorial+mathematics+douglas+west+pdfPDF 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_off0000b428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB428 11424 bytes
SHA-256: 51a4dfe2fb93e9288f5071a8eed997cf955588e4fa0bb2c6348b5889e371e12a
font_01_sfnt_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AA 14452 bytes
SHA-256: fdf1bb739f0726dd7fae1afb641ad9c49f38ceb1d88f3606f1435606bcf07e64