Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3ec65c3906df57…

MALICIOUS

PDF

79.2 KB Created: 2021-08-17 10:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 13374ccf038af5c8282cb1468e093d0b SHA-1: 8861ece12e5602e0dfd4a1beb4b45eea09b119b5 SHA-256: 8e3ec65c3906df57dfb45fa4fad9e093b7453117a9da6a7a7ed41351fb464276
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of a 'download button' lure and a callback lure further supports a malicious intent to trick the user into downloading a payload or engaging with a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • 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.
  • 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://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/327a16da4b0e4f9ebf8348dffaf27c3c/woxogekorobat.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7qo11f5lklpu2fb5kr5t1595dl/91735233551.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/351d030f671993f469115e91486af18e/pixubusoredawu.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/1c9cf21ea9e74fcd159e82c375ab8ffc/47828388523.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071cdf7435d1---ximetisogotim.pdfIn PDF document text
    • http://davcpundri.com/css/file/4075563224.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/pepaxibojoweluv.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/21825629575.pdfIn PDF document text
    • http://nfc.soo.jp/file/xojatojasowotunu.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/peniba.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084015901385---85072589006.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2516c84746---82257394734.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b631222bf4d81bec82ffa2fddd3af45a/dosil.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/30174290064.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6935dc419---fisewadebibaxetejufafep.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-3/20210503162740186907.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/51c801d5e456df23b0a9e2de7c17ca2f/jamosed.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3596728be---31652022555.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/pigukizunemekuw.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607086d9110ed---gutukozugiwoxi.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/jafifud.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcce7cc0d47---kalexuvokikutoworuxiwedas.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/nobibilebasuwidarevijo.pdfIn PDF document text
    • http://mopron.ru/upload/files/69980187359.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/mivadevawumagesut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fluid+mechanics+fundamentals+and+applications+solutions+manual+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_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 10864 bytes
SHA-256: b1259c6896e0ffc34a277e19b153d50f2de1cfdaf5d85459af0d5967c68f0595
font_01_sfnt_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 17112 bytes
SHA-256: f0905b59e7d5896f7bea1720df14a58f460c14a33ecb0792df55617dfdd1bf78

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