Malicious PDF — malware analysis report

Static analysis result for SHA-256 e276a81723e57497…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 14:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c05b13e314a5758826efba1bfddfca9c SHA-1: 3a0e95eda22a88a134a97a32f565b35621bc5fab SHA-256: e276a81723e57497b915fe4c252d53ace217d4acf2fe8859d9af54d7281ddd47
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, and also as a callback phishing lure. The embedded URLs suggest the document is designed to redirect users to malicious sites, likely to download further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://coretry.ru/uplcv?utm_term=100+math+addition+facts+worksheets PDF link annotation
    • http://julianina.dk/upload/file/pegazamo.pdfIn PDF document text
    • https://areicon.com/images/file/95647093901.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/48bad8048f12a69fb46df8537407dcdb/81906537810.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/zuvatodolapamuna.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/pukupumoso.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/87596636459.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/46804342842.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/rugikaxujo.pdfIn PDF document text
    • http://vaynhe.com/upload/files/4918342117.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/e68sn1udrv7qsv7rscae4jsnl6/55222479938.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/88973780937.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/jegetiloxij.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/nodovomunejalagibasujin.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/qi8fqnnohslnbf7u0sb25ioro4/76948549827.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/h61crmj0e3ftoqo8f40enmtk81/6829637139.pdfIn PDF document text
    • http://apsons.eu/files/file/jevofaxorif.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c5df16e0f7117c10a7812c9db5d16c2b/24272013329.pdfIn PDF document text
    • http://fruitvita.com/files/files/18882393236.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/70052854692.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16115469418814---fobubirikemiz.pdfIn PDF document text
    • http://chamdure.com/DATA/files/58800088955.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bca87883817---58844806959.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/90922854932.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609441dd85a1d---tilawegudet.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_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 17652 bytes
SHA-256: 0d7ab52903387abfc88ebb98c6ce15b3f303afd70ca88420edad8735d13cf7e3
font_01_sfnt_off00010f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12718 10948 bytes
SHA-256: e5b152e5e1af210da4d3dad98088b5dd34066b16500b76979543645340e60831

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